$DUOL
Duolingo, Inc. Stock $duol

$duol Overview Financials Valuation SEC Filings Company Website

2023 Q4 Form 10-K Financial Statement

#000156208824000050 Filed on February 29, 2024

Income Statement

Concept	2023 Q4	2023
Revenue	$151.0M	$531.1M
YoY Change	45.42%	43.74%
Cost Of Revenue	$40.57M	$142.1M
YoY Change	46.1%	42.92%
Gross Profit	$110.4M	$389.0M
YoY Change	45.18%	44.04%
Gross Profit Margin	73.13%	73.24%
Selling, General & Admin	$54.55M	$207.9M
YoY Change	10.25%	12.5%
% of Gross Profit	49.41%	53.45%
Research & Development	$49.84M	$194.4M
YoY Change	12.07%	29.19%
% of Gross Profit	45.14%	49.96%
Depreciation & Amortization	$2.042M	$7.095M
YoY Change	41.41%	45.69%
% of Gross Profit	1.85%	1.82%
Operating Expenses	$105.6M	$402.3M
YoY Change	12.11%	19.99%
Operating Profit	$4.795M	-$13.26M
YoY Change	-126.42%	-79.66%
Interest Expense	$9.284M	$31.09M
YoY Change	28.32%	329.73%
% of Operating Profit	193.62%
Other Income/Expense, Net	$404.0K	-$55.00K
YoY Change	-117.59%	-91.86%
Pretax Income	$15.13M	$17.78M
YoY Change	-214.52%	-130.32%
Income Tax	$3.016M	$1.710M
% Of Pretax Income	19.93%	9.62%
Net Earnings	$12.12M	$16.07M
YoY Change	-186.98%	-126.97%
Net Earnings / Revenue	8.03%	3.03%
Basic Earnings Per Share		$0.39
Diluted Earnings Per Share	$0.26	$0.35
COMMON SHARES
Basic Shares Outstanding
Diluted Shares Outstanding		46.52M shares

Balance Sheet

Concept	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$747.6M	$747.6M
YoY Change	22.93%	22.93%
Cash & Equivalents	$747.6M	$747.6M
Short-Term Investments
Other Short-Term Assets	$61.21M	$61.21M
YoY Change	44.8%	44.8%
Inventory
Prepaid Expenses
Receivables	$88.98M	$88.98M
Other Receivables	$0.00	$0.00
Total Short-Term Assets	$897.8M	$897.8M
YoY Change	28.78%	28.78%
LONG-TERM ASSETS
Property, Plant & Equipment	$11.79M	$30.90M
YoY Change	-9.08%	-12.92%
Goodwill	$4.050M
YoY Change	0.0%
Intangibles	$16.00M
YoY Change	88.24%
Long-Term Investments
YoY Change
Other Assets	$1.718M	$5.219M
YoY Change	14.0%	143.88%
Total Long-Term Assets	$56.16M	$56.16M
YoY Change	11.95%	11.95%
TOTAL ASSETS
Total Short-Term Assets	$897.8M	$897.8M
Total Long-Term Assets	$56.16M	$56.16M
Total Assets	$954.0M	$954.0M
YoY Change	27.65%	27.65%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$2.447M	$2.447M
YoY Change	107.9%	107.9%
Accrued Expenses	$24.93M	$20.61M
YoY Change	13.48%	37.46%
Deferred Revenue	$249.2M
YoY Change	58.17%
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$277.4M	$277.4M
YoY Change	52.59%	52.59%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$21.09M	$21.09M
YoY Change	-10.25%	-10.25%
Total Long-Term Liabilities	$21.09M	$21.09M
YoY Change	-10.25%	-10.25%
TOTAL LIABILITIES
Total Short-Term Liabilities	$277.4M	$277.4M
Total Long-Term Liabilities	$21.09M	$21.09M
Total Liabilities	$298.5M	$298.5M
YoY Change	45.4%	45.4%
SHAREHOLDERS EQUITY
Retained Earnings	-$214.4M
YoY Change	-6.97%
Common Stock	$4.000K
YoY Change	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$655.5M	$655.5M
YoY Change
Total Liabilities & Shareholders Equity	$954.0M	$954.0M
YoY Change	27.65%	27.65%

Cashflow Statement

Concept	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$12.12M	$16.07M
YoY Change	-186.98%	-126.97%
Depreciation, Depletion And Amortization	$2.042M	$7.095M
YoY Change	41.41%	45.69%
Cash From Operating Activities	$49.19M	$153.6M
YoY Change	323.79%	186.29%
INVESTING ACTIVITIES
Capital Expenditures	$4.148M	$3.191M
YoY Change	363.46%	-42.63%
Acquisitions		$0.00
YoY Change		-100.0%
Other Investing Activities	$0.00	$100.0K
YoY Change	-100.0%	-102.47%
Cash From Investing Activities	-$4.148M	-$13.58M
YoY Change	-16.12%	-4.16%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$0.00
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	3.563M	$2.135M
YoY Change	129.87%	-85.55%
NET CHANGE
Cash From Operating Activities	49.19M	$153.6M
Cash From Investing Activities	-4.148M	-$13.58M
Cash From Financing Activities	3.563M	$2.135M
Net Change In Cash	48.61M	$142.2M
YoY Change	491.84%	162.02%
FREE CASH FLOW
Cash From Operating Activities	$49.19M	$153.6M
Capital Expenditures	$4.148M	$3.191M
Free Cash Flow	$45.05M	$150.4M
YoY Change	320.47%	212.77%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	16067000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	16067000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-59574000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-59574000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	16067000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-60135000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	7095000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	4870000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	95221000	usd
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001562088
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2022Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#AccruedLiabilitiesCurrent
CY2023Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#AccruedLiabilitiesCurrent
CY2023Q4	duol	Lessee Operating Lease Term Before Rent Increase LesseeOperatingLeaseTermBeforeRentIncrease	P6Y
CY2023Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#AccruedLiabilitiesCurrent
CY2022Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#AccruedLiabilitiesCurrent
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	001-40653
CY2023	dei	Entity Registrant Name EntityRegistrantName	Duolingo, Inc.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	45-3055872
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	5900 Penn Avenue
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Pittsburgh
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	PA
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	15206
CY2023	dei	City Area Code CityAreaCode	(412)
CY2023	dei	Local Phone Number LocalPhoneNumber	567-6602
CY2023	dei	Security12b Title Security12bTitle	Class A common stock, $0.0001 per share
CY2023	dei	Trading Symbol TradingSymbol	DUOL
CY2023	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	3891337096	usd
CY2023	dei	Auditor Firm AuditorFirmId	34
CY2023	dei	Auditor Name AuditorName	Deloitte & Touche LLP
CY2023	dei	Auditor Location AuditorLocation	New York, New York
CY2023	dei	Auditor Name AuditorName	Deloitte & Touche LLP
CY2023	dei	Auditor Location AuditorLocation	New York, New York
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	747610000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	608180000	usd
CY2023Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	88975000	usd
CY2022Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	46728000	usd
CY2023Q4	us-gaap	Capitalized Contract Cost Net Current CapitalizedContractCostNetCurrent	53931000	usd
CY2022Q4	us-gaap	Capitalized Contract Cost Net Current CapitalizedContractCostNetCurrent	35041000	usd
CY2023Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	7282000	usd
CY2022Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	7234000	usd
CY2023Q4	us-gaap	Assets Current AssetsCurrent	897798000	usd
CY2022Q4	us-gaap	Assets Current AssetsCurrent	697183000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	11792000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	12969000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	4050000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	4050000	usd
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	15995000	usd
CY2022Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	8497000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	19103000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	22508000	usd
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	766000	usd
CY2022Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	633000	usd
CY2023Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	2735000	usd
CY2022Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	0	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1718000	usd
CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1507000	usd
CY2023Q4	us-gaap	Assets Assets	953957000	usd
CY2022Q4	us-gaap	Assets Assets	747347000	usd
CY2023Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	2447000	usd
CY2022Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	1177000	usd
CY2023Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	249192000	usd
CY2022Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	157550000	usd
CY2023Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	792000	usd
CY2022Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	1069000	usd
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	24931000	usd
CY2022Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	21970000	usd
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	277362000	usd
CY2022Q4	us-gaap	Liabilities Current LiabilitiesCurrent	181766000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	21094000	usd
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	23503000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	298456000	usd
CY2022Q4	us-gaap	Liabilities Liabilities	205269000	usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	4000	usd
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	4000	usd
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	869918000	usd
CY2022Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	772562000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-214421000	usd
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-230488000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	655501000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	542078000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	953957000	usd
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	747347000	usd
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	531109000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	369495000	usd
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	250772000	usd
CY2023	us-gaap	Cost Of Revenue CostOfRevenue	142105000	usd
CY2022	us-gaap	Cost Of Revenue CostOfRevenue	99431000	usd
CY2021	us-gaap	Cost Of Revenue CostOfRevenue	69186000	usd
CY2022	us-gaap	Gross Profit GrossProfit	270064000	usd
CY2021	us-gaap	Gross Profit GrossProfit	181586000	usd
CY2021	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	103833000	usd
CY2023	us-gaap	Operating Expenses OperatingExpenses	402263000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	-13259000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	-65195000	usd
CY2023	us-gaap	Other Income OtherIncome	590000	usd
CY2022	us-gaap	Other Income OtherIncome	131000	usd
CY2021	us-gaap	Other Income OtherIncome	318000	usd
CY2023	us-gaap	Other Expenses OtherExpenses	645000	usd
CY2022	us-gaap	Other Expenses OtherExpenses	807000	usd
CY2021	us-gaap	Other Expenses OtherExpenses	288000	usd
CY2022	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-676000	usd
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	30000	usd
CY2021	duol	Income Loss From Continuing Operations Before Interest Income Income Taxes Noncontrolling Interests IncomeLossFromContinuingOperationsBeforeInterestIncomeIncomeTaxesNoncontrollingInterests	-59977000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1710000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-60135000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-60135000	usd
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.57
CY2020Q4	us-gaap	Temporary Equity Shares Outstanding TemporaryEquitySharesOutstanding	19074000	shares
CY2020Q4	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	182609000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	-80691000	usd
CY2021	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	426192000	usd
CY2021	duol	Temporary Equity Shares Converted TemporaryEquitySharesConverted	-19074000	shares
CY2021	duol	Temporary Equity Amount Converted TemporaryEquityAmountConverted	-182609000	usd
CY2021	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	182609000	usd
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	40804000	usd
CY2021	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	12480000	usd
CY2021	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	868000	usd
CY2021	duol	Stock Repurchased During Period Options Value StockRepurchasedDuringPeriodOptionsValue	7335000	usd
CY2021	duol	Stock Repurchased During Period Options Value StockRepurchasedDuringPeriodOptionsValue	7335000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-60135000	usd
CY2021Q4	us-gaap	Temporary Equity Shares Outstanding TemporaryEquitySharesOutstanding	0	shares
CY2021Q4	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	0	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	513056000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	513056000	usd
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	73820000	usd
CY2022	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	14776000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-59574000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	542078000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	542078000	usd
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CY2023	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	11482000	usd
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CY2023	us-gaap	Net Income Loss NetIncomeLoss	16067000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	655501000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-59574000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2726000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	73820000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	40804000	usd
CY2023	us-gaap	Gain Loss On Disposition Of Intangible Assets GainLossOnDispositionOfIntangibleAssets	100000	usd
CY2022	us-gaap	Gain Loss On Disposition Of Intangible Assets GainLossOnDispositionOfIntangibleAssets	0	usd
CY2021	us-gaap	Gain Loss On Disposition Of Intangible Assets GainLossOnDispositionOfIntangibleAssets	0	usd
CY2023	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-433000	usd
CY2022	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	0	usd
CY2021	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	0	usd
CY2023	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	91642000	usd
CY2022	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	59283000	usd
CY2021	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	43475000	usd
CY2023	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	42247000	usd
CY2022	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	13565000	usd
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	12713000	usd
CY2023	duol	Increase Decrease In Capitalized Contract Costs Net IncreaseDecreaseInCapitalizedContractCostsNet	18890000	usd
CY2022	duol	Increase Decrease In Capitalized Contract Costs Net IncreaseDecreaseInCapitalizedContractCostsNet	10822000	usd
CY2021	duol	Increase Decrease In Capitalized Contract Costs Net IncreaseDecreaseInCapitalizedContractCostsNet	10634000	usd
CY2023	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	48000	usd
CY2022	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1415000	usd
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	4048000	usd
CY2023	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	1261000	usd
CY2022	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-6655000	usd
CY2023	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	3444000	usd
CY2021	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	-365000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	53656000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	9170000	usd
CY2021	duol	Payments For Software And Purchases Of Intangible Assets PaymentsForSoftwareAndPurchasesOfIntangibleAssets	2620000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5562000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3586000	usd
CY2023	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	100000	usd
CY2022	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	usd
CY2021	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	usd
CY2022	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	usd
CY2023	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	usd
CY2022	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	4050000	usd
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-13584000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-14174000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-6206000	usd
CY2023	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	0	usd
CY2022	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	0	usd
CY2021	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	426191000	usd
CY2023	us-gaap	Proceeds From Issuance Of Convertible Preferred Stock ProceedsFromIssuanceOfConvertiblePreferredStock	0	usd
CY2022	us-gaap	Proceeds From Issuance Of Convertible Preferred Stock ProceedsFromIssuanceOfConvertiblePreferredStock	0	usd
CY2021	us-gaap	Proceeds From Issuance Of Convertible Preferred Stock ProceedsFromIssuanceOfConvertiblePreferredStock	0	usd
CY2023	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	13617000	usd
CY2022	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	14776000	usd
CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	12480000	usd
CY2023	duol	Payments For Repurchase Of Stock Options PaymentsForRepurchaseOfStockOptions	0	usd
CY2022	duol	Payments For Repurchase Of Stock Options PaymentsForRepurchaseOfStockOptions	0	usd
CY2021	duol	Payments For Repurchase Of Stock Options PaymentsForRepurchaseOfStockOptions	7335000	usd
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	usd
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	868000	usd
CY2023	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	11482000	usd
CY2022	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	0	usd
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	0	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2135000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	14776000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	430468000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	142165000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	54258000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	433432000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	608180000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	553922000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	120490000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	750345000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	608180000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	553922000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	0	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	0	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	0	usd
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2320000	usd
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	615000	usd
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	132000	usd
CY2023	duol	Cloud Computing Expenditures Incurred But Not Yet Paid CloudComputingExpendituresIncurredButNotYetPaid	0	usd
CY2022	duol	Cloud Computing Expenditures Incurred But Not Yet Paid CloudComputingExpendituresIncurredButNotYetPaid	0	usd
CY2021	duol	Cloud Computing Expenditures Incurred But Not Yet Paid CloudComputingExpendituresIncurredButNotYetPaid	64000	usd
CY2023	duol	Capitalized Software And Purchases Of Intangible Assets Expenditures Incurred But Not Yet Paid CapitalizedSoftwareAndPurchasesOfIntangibleAssetsExpendituresIncurredButNotYetPaid	0	usd
CY2022	duol	Capitalized Software And Purchases Of Intangible Assets Expenditures Incurred But Not Yet Paid CapitalizedSoftwareAndPurchasesOfIntangibleAssetsExpendituresIncurredButNotYetPaid	1121000	usd
CY2021	duol	Capitalized Software And Purchases Of Intangible Assets Expenditures Incurred But Not Yet Paid CapitalizedSoftwareAndPurchasesOfIntangibleAssetsExpendituresIncurredButNotYetPaid	342000	usd
CY2023	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	165000	usd
CY2022	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	166000	usd
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	230000	usd
CY2023	duol	Landlord Incentives Incurred But Not Yet Paid LandlordIncentivesIncurredButNotYetPaid	0	usd
CY2022	duol	Landlord Incentives Incurred But Not Yet Paid LandlordIncentivesIncurredButNotYetPaid	2148000	usd
CY2021	duol	Landlord Incentives Incurred But Not Yet Paid LandlordIncentivesIncurredButNotYetPaid	0	usd
CY2023	duol	Right Of Use Asset Increase From Modifications Operating Lease Liabilities RightOfUseAssetIncreaseFromModificationsOperatingLeaseLiabilities	2024000	usd
CY2022	duol	Right Of Use Asset Increase From Modifications Operating Lease Liabilities RightOfUseAssetIncreaseFromModificationsOperatingLeaseLiabilities	0	usd
CY2021	duol	Right Of Use Asset Increase From Modifications Operating Lease Liabilities RightOfUseAssetIncreaseFromModificationsOperatingLeaseLiabilities	0	usd
CY2023	duol	Stock Issuance Costs Incurred But Not Yet Paid StockIssuanceCostsIncurredButNotYetPaid	0	usd
CY2022	duol	Stock Issuance Costs Incurred But Not Yet Paid StockIssuanceCostsIncurredButNotYetPaid	0	usd
CY2021	duol	Stock Issuance Costs Incurred But Not Yet Paid StockIssuanceCostsIncurredButNotYetPaid	0	usd
CY2021Q3	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	455532000	usd
CY2021Q3	us-gaap	Temporary Equity Shares Authorized TemporaryEquitySharesAuthorized	19074000	shares
CY2021Q3	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	182609000	usd
CY2023Q4	duol	Number Of Languages NumberOfLanguages	40	language
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-bottom:9pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:130%">Use of Estimates—</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:130%">The preparation of Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the Consolidated Financial Statements and accompanying notes. Significant estimates and assumptions reflected in the Consolidated Financial Statements include, but are not limited to, useful lives of property </span></div><div style="margin-bottom:9pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:130%">and equipment, valuation of deferred tax assets and liabilities, stock-based compensation, common stock valuation, operating lease right-of-use assets and liabilities, capitalization of internally developed software and associated useful lives and contingent liabilities. Actual results may differ materially from such estimates. Management believes that the estimates, and judgments upon which they rely, are reasonable based upon information available to them at the time that these estimates and judgments are made. To the extent that there are material differences between these estimates and actual results, the Company’s Consolidated Financial Statements will be affected.</span></div>
CY2023Q4	duol	Number Of Sources Of Revenue NumberOfSourcesOfRevenue	4	sourceofrevenue
CY2023Q4	duol	Contract With Customer Threshold To Take Exam ContractWithCustomerThresholdToTakeExam	P21D
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	747610000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	608180000	usd
CY2023	us-gaap	Advertising Expense AdvertisingExpense	52969000	usd
CY2022	us-gaap	Advertising Expense AdvertisingExpense	48111000	usd
CY2021	us-gaap	Advertising Expense AdvertisingExpense	42964000	usd
CY2021Q1	duol	Selling And Marketing Expense Volunteer Program Award Amount SellingAndMarketingExpenseVolunteerProgramAwardAmount	4220000	usd
CY2021Q1	duol	Selling And Marketing Expense Volunteer Program Fee Amount SellingAndMarketingExpenseVolunteerProgramFeeAmount	526000	usd
CY2023	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="margin-bottom:9pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:130%">Concentration of Credit Risk</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:130%">—The Company’s concentration of credit risk relates to financial institutions holding the Company’s cash and cash equivalents and platforms with significant accounts receivable balances and revenue transactions.</span></div><div style="margin-bottom:9pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:130%">The Company maintains cash deposits with financial institutions that may exceed federally insured limits at times. Management believes that the financial institutions that hold the Company’s deposits are financially credit worthy and, accordingly, minimal credit risk exists with respect to those balances.</span></div>
CY2023	us-gaap	Number Of Reporting Units NumberOfReportingUnits	1	reporting_unit
CY2022	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	usd
CY2023	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	usd
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	usd
CY2022Q4	duol	Lessor Operating Sublease Term Of Contract LessorOperatingSubleaseTermOfContract	P68M
CY2022Q4	duol	Lessor Operating Sublease Payments To Be Received LessorOperatingSubleasePaymentsToBeReceived	358000	usd
CY2023Q4	duol	Number Of Sources Of Revenue NumberOfSourcesOfRevenue	4	sourceofrevenue
CY2023Q4	duol	Contract With Customer Number Of Users Per Subscription ContractWithCustomerNumberOfUsersPerSubscription	6	user
CY2023Q4	duol	Contract With Customer Certification Period Prior To Test Completion ContractWithCustomerCertificationPeriodPriorToTestCompletion	PT48H
CY2023Q4	duol	Contract With Customer Threshold To Take Exam ContractWithCustomerThresholdToTakeExam	P21D
CY2023Q4	duol	Contract With Customer Threshold Period To Take Exam For Bulk Purchase ContractWithCustomerThresholdPeriodToTakeExamForBulkPurchase	P1Y
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	531109000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	369495000	usd
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	250772000	usd
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	531109000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	369495000	usd
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	250772000	usd
CY2022Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	157550000	usd
CY2021Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	98267000	usd
CY2023	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	-157550000	usd
CY2022	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	-98267000	usd
CY2023	duol	Contract With Customer Liability Revenue Recognized Excluding Opening Balance ContractWithCustomerLiabilityRevenueRecognizedExcludingOpeningBalance	-287429000	usd
CY2022	duol	Contract With Customer Liability Revenue Recognized Excluding Opening Balance ContractWithCustomerLiabilityRevenueRecognizedExcludingOpeningBalance	-199130000	usd
CY2023	duol	Contract With Customer Liability Additions During The Period ContractWithCustomerLiabilityAdditionsDuringThePeriod	536621000	usd
CY2022	duol	Contract With Customer Liability Additions During The Period ContractWithCustomerLiabilityAdditionsDuringThePeriod	356680000	usd
CY2023Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	249192000	usd
CY2022Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	157550000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	24060000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	21187000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	12268000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8218000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	11792000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	12969000	usd
CY2023	us-gaap	Depreciation Depreciation	4100000	usd
CY2022	us-gaap	Depreciation Depreciation	3118000	usd
CY2021	us-gaap	Depreciation Depreciation	2033000	usd
CY2023Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	26895000	usd
CY2022Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	16809000	usd
CY2023Q4	us-gaap	Other Finite Lived Intangible Assets Gross OtherFiniteLivedIntangibleAssetsGross	117000	usd
CY2022Q4	us-gaap	Other Finite Lived Intangible Assets Gross OtherFiniteLivedIntangibleAssetsGross	18000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	27012000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	16827000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	11017000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	8330000	usd
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	15995000	usd
CY2022Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	8497000	usd
CY2022	us-gaap	Capitalized Computer Software Additions CapitalizedComputerSoftwareAdditions	5665000	usd
CY2023	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	2995000	usd
CY2022	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	1752000	usd
CY2021	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	693000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	4050000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	4050000	usd
CY2023Q4	duol	Goodwill Tax Deductible Amount GoodwillTaxDeductibleAmount	3713000	usd
CY2022Q4	duol	Goodwill Tax Deductible Amount GoodwillTaxDeductibleAmount	3983000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P5Y
CY2022Q4	duol	Lessor Operating Sublease Term Of Contract LessorOperatingSubleaseTermOfContract	P68M
CY2023Q4	duol	Lessor Operating Sublease Payments To Be Received LessorOperatingSubleasePaymentsToBeReceived	295000	usd
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	7459000	usd
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	7076000	usd
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	1919000	usd
CY2023	us-gaap	Short Term Lease Cost ShortTermLeaseCost	48000	usd
CY2022	us-gaap	Short Term Lease Cost ShortTermLeaseCost	125000	usd
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1266000	usd
CY2023	us-gaap	Variable Lease Cost VariableLeaseCost	252000	usd
CY2022	us-gaap	Variable Lease Cost VariableLeaseCost	63000	usd
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	28000	usd
CY2023	us-gaap	Lease Cost LeaseCost	7759000	usd
CY2022	us-gaap	Lease Cost LeaseCost	7264000	usd
CY2021	us-gaap	Lease Cost LeaseCost	3213000	usd
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	7512000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	5168000	usd
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	1819000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	909000	usd
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	22274000	usd
CY2023	duol	Right Of Use Asset Increase Decrease From Modifications Net Operating Lease Liabilities RightOfUseAssetIncreaseDecreaseFromModificationsNetOperatingLeaseLiabilities	-2024000	usd
CY2022	duol	Right Of Use Asset Increase Decrease From Modifications Net Operating Lease Liabilities RightOfUseAssetIncreaseDecreaseFromModificationsNetOperatingLeaseLiabilities	1586000	usd
CY2021	duol	Right Of Use Asset Increase Decrease From Modifications Net Operating Lease Liabilities RightOfUseAssetIncreaseDecreaseFromModificationsNetOperatingLeaseLiabilities	235000	usd
CY2023	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	0	usd
CY2022	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	0	usd
CY2021	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	31000	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0738
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0692
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0577
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	5607000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	3386000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3399000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3463000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3528000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	15735000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	35118000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	10080000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	25038000	usd
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	3944000	usd
CY2022Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4903000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	21094000	usd
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	23503000	usd
CY2023Q4	duol	Lessee Lease Area Of Office Building LesseeLeaseAreaOfOfficeBuilding	85666	sqft
CY2023Q4	duol	Lessee Operating Lease Liability To Be Paid Per Month LesseeOperatingLeaseLiabilityToBePaidPerMonth	442000	usd
CY2023Q4	duol	Lessee Operating Lease Number Of Months Before Payment Is Due LesseeOperatingLeaseNumberOfMonthsBeforePaymentIsDue	20	month
CY2023Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	2735000	usd
CY2022Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	0	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	16501000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-60099000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-59737000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	1276000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	1463000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-221000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-58636000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-59958000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	895000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	302000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	607000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	327000	usd
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	80000	usd
CY2023	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	341000	usd
CY2022	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	524000	usd
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	97000	usd
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CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1153000	usd
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	177000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	usd
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CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	usd
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	usd
CY2023	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-133000	usd
CY2022	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-215000	usd
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	0	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-133000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-215000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	0	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1710000	usd
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CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	177000	usd
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CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2985000	shares
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CY2023Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	594157000	usd
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CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
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CY2023Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	1393000	usd
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CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	40804000	usd
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CY2023Q4	us-gaap	Accrued Marketing Costs Current AccruedMarketingCostsCurrent	4732000	usd
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CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	23433000	shares
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CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	3000000	shares
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	6626000	shares
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Files In Submission

Name	View Source	Status
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duol-20231231.htm	Edgar Link	pending
duol-20231231.xsd	Edgar Link	pending
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duolingo-2023q410kex211.htm	Edgar Link	pending
duolingo-2023q410kex311.htm	Edgar Link	pending
duolingo-2023q410kex312.htm	Edgar Link	pending
duolingo-2023q410kex321.htm	Edgar Link	pending
duolingo-clawbackpolicya.htm	Edgar Link	pending
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duolingo-clawbackpolicya002.jpg	Edgar Link	pending
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duol-20231231_cal.xml	Edgar Link	unprocessable
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duol-20231231_lab.xml	Edgar Link	unprocessable
duol-20231231_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
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R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
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2023 Q4 Form 10-K Financial Statement

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$DUOL
Duolingo, Inc. Stock $duol