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DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Details) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
	Jul. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) language shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)	Jul. 29, 2021 USD ($) shares	Jul. 15, 2021 shares	Dec. 31, 2020 USD ($)
Business And Organization [Line Items]
Issuance of common stock in connection with the initial public offering, net of underwriting discounts and issuance costs | $	$ 455,532	$ 0	$ 0	$ 426,191
Authorized (in shares)					19,074
Carrying value of convertible preferred stock | $				$ 0	$ 182,609		$ 182,609
Number of languages, more than | language		40
Common Class A
Business And Organization [Line Items]
Common stock, shares outstanding (in shares)		36,311	31,899
Common Class A | IPO
Business And Organization [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	5,872
Sale of stock, price per share (in usd per share) | $ / shares	$ 102.00
Common Class A | IPO | Stockholders
Business And Organization [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	1,406
Common Class A | IPO | Duolingo
Business And Organization [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	4,466
Common Class A | Over-Allotment Option
Business And Organization [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	766
Common Class B
Business And Organization [Line Items]
Conversion ratio					1
Common stock, shares outstanding (in shares)		6,215	8,462
Common Class B | Founders
Business And Organization [Line Items]
Common stock, shares outstanding (in shares)						6,930

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