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REVENUE
 6 Months Ended
Jun. 30, 2025
Revenue from Contract with Customer [Abstract]  
REVENUE REVENUE
Disaggregation of Revenue
In accordance with ASC 606, Revenue from Contracts with Customers, the Company disaggregates revenue from contracts with customers into revenue streams, which most closely depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors.
Three Months Ended June 30,Six Months Ended June 30,
(In thousands)2025202420252024
Revenues:
Subscription$210,678 $143,909 $401,665 $275,597 
Other (1)41,587 34,418 81,343 70,283 
Total revenues$252,265 $178,327 $483,008 $345,880 
________________
(1) Other revenue is comprised of the below.
Three Months Ended June 30,Six Months Ended June 30,
(In thousands)2025202420252024
Advertising$20,603 $13,258 $38,485 $26,210 
Duolingo English Test10,088 10,698 22,074 23,453 
In-App Purchases10,390 10,176 19,832 20,100 
Other506 286 952 520 
Total other revenue$41,587 $34,418 $81,343 $70,283 

Two service providers, Apple and Google processed 61.6% and 23.9%, and three service providers, Apple, Google and Stripe, processed 61.3%, 23.6%, and 10.4% of total revenues for the three and six months ended June 30, 2025, respectively. Three services providers, Apple, Google, and Stripe processed 60.7%, 23.7%, and 11.2%, and 60.0%, 23.7% and 12.0% of total revenues for the three and six months ended June 30, 2024, respectively.
Deferred revenue mostly consists of payments received in advance of revenue recognition, and is mostly related to time-based subscriptions, which will be recognized into revenue over the course of the upcoming year (recognized over 12 months or less). Additionally, the Duolingo English Test has deferred revenue related to tests that have been purchased, but will not be recognized until the tests have been proctored. Changes in deferred revenues were as follows:
Six Months Ended June 30,
(In thousands)20252024
Beginning balance—January 1$372,884 $249,192 
Amount from beginning balance recognized into revenue(262,611)(176,854)
Recognition of deferred revenue(175,701)(121,625)
Deferral of revenue496,605 340,764 
Ending balance—June 30$431,177 $291,477