our mission is to develop the best education in the world and make it universally available. o. DUOLINGO Q3 / FY 2025 2

Q3 Highlights User Metrics Q3 2024 Q3 2025 Daily Active Users 37.2M 50.5M 36% YoY Monthly Active Users 113.1M 135.3M 20% YoY Paid Subscribers 8.6M 11.5M at period end 34% YoY Paid Subscriber Penetration 8.5% 9.0% as % of LTM MAUs Financial Metrics Q3 2024 Q3 2025 Revenue 192.6M 271.7M 41% YoY Total Bookings 211.5M 281.9M 33% YoY Net Income (1) 23.4M 292.2M Adjusted EBITDA 47.5M 80.0M 24.7% margin 29.5% margin (1) During the three months ended September 30, 2025, the Company released the valuation allowance previously recorded against its federal and state deferred tax assets, resulting in a one-time income-tax benefit, net of a return-to-provision adjustment, in the period of $222.7 million. DUOLINGO Q3 / FY 2025 3

Dear shareholders, 2025 is shaping up to be another standout year for us. Through the first nine months, DAUs and revenue are both up 40% or more compared to the same period last year, and we continue to expand profitability. In Q3, we crossed an important milestone: more than 50 million people now use Duolingo every day. We also saw chess become our fastest-growing subject, had our biggest brand moment in Asia by partnering with Luckin Coffee, and launched a LinkedIn integration so learners can showcase their Duolingo Score. coffee 123 0123 x Over 26,000 Luckin stores in Asia partnered with us, selling more than 10 million Duolingo-branded drinks in two weeks. DAUs grew 36% year over year in Q3, even on top of an exceptional Q3 last year. Growth was slightly slower than Q2 in part because we posted less “unhinged” content on our English-speaking social media accounts as we listened to community feedback and prioritized building long-term brand sentiment. We recently started posting more unhinged content, and while impressions haven’t yet reached peak volume, we’ve seen a significant increase in them. We also modestly increased marketing spend to help drive momentum, particularly in the US. These actions support near-term user growth, but long-term gains will come from making our product even more engaging and effective. Taking the long view One of our five operating principles is “take the long view.” The opportunity ahead of us is to teach billions of people, and while we’ve made incredible progress, we know we’re early in our journey.

m gains will come from making our product even more engaging and effective. Taking the long view One of our five operating principles is “take the long view.” The opportunity ahead of us is to teach billions of people, and while we’ve made incredible progress, we know we’re early in our journey. We focus on three core areas as we look to continuously improve our product: monetization, user growth, and teaching better across all our subjects. Each impacts our financial results on a different timeline. Monetization improvements, such as getting more users to subscribe, show up immediately. User growth improvements take longer to show up in our finances, since it takes time for people to subscribe. And teaching improvements take the longest, since they take time to improve user growth, which in turn takes time to improve monetization. DUOLINGO Q3 / FY 2025 4