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EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2025
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | As the liquidation and dividend rights are identical for Class A and Class B common stock, the undistributed earnings are allocated on a proportional basis and the resulting net income per share attributable to common stockholders will, therefore, be the same for both Class A and Class B common stock on an individual or combined basis.
| Three Months Ended June 30, | Six Months Ended June 30,
(In thousands, except per share data) | 2025 |  | 2024 | 2025 |  | 2024 |  |
Numerator: |  |  |  |  |  |  |  |
Net income attributable to Class A and Class B common stockholders | $ | 44,781 |  |  | $ | 24,351 |  | $ | 79,916 |  |  | $ | 51,307 |  |  |
Denominator: |  |  |  |  |  |  |  |
Weighted-average shares in computing net income per share attributable to Class A and Class B common stockholders, basic and diluted | 45,610 |  |  | 43,260 |  | 45,380 |  |  | 43,020 |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |
Founder awards where performance has been met | 720 |  |  | 270 |  | 720 |  |  | 270 |  |  |
Dilutive effect of stock options outstanding (1) | 1,032 |  |  | 2,216 |  | 1,032 |  |  | 2,216 |  |  |
RSUs outstanding | 1,638 |  |  | 2,024 |  | 1,638 |  |  | 2,024 |  |  |
Denominator for dilutive net income per common share - weighted-average shares | 49,000 |  |  | 47,770 |  | 48,770 |  |  | 47,530 |  |  |
Basic income per common share | $ | 0.98 |  |  | $ | 0.56 |  | $ | 1.76 |  |  | $ | 1.19 |  |  |
Diluted income per common share | $ | 0.91 |  |  | $ | 0.51 |  | $ | 1.64 |  |  | $ | 1.08 |  |  |
________________ (1) The Company had 1.1 million options outstanding as of June 30, 2025. The estimated dilutive effect is calculated as the number of shares expected to be issued upon vesting or exercise, adjusted for the strike price proceeds that are received by the Company and assumed to be used to repurchase shares of Duolingo common stock.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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