Duolingo used artificial intelligence as a cornerstone of its Q2 2025 growth strategy, driving both user engagement and revenue expansion.
Credit Instagram
The company’s AI-powered Max subscription tier, featuring video call sessions with virtual tutors, delivered measurable improvements in speaking skills and helped boost average revenue per user (ARPU).
AI was also central to the rollout of the new Energy mechanic, which replaced the Hearts system and shifted from penalizing mistakes to rewarding progress. This gamified, positive-reinforcement model increased daily active users, time spent learning, and subscription conversions simultaneously — a rare triple boost for a single feature.
AI’s influence extended to content development, with adaptive learning technology powering the new Chess course, now the fastest-growing subject on the platform with over a million daily active iOS users. Lower-than-expected AI operational costs also contributed to better-than-projected gross margins, showing improved efficiency in scaling advanced features.
Duolingo said its Q2 2025 gross margin reached 72.4 percent, up 130 basis points from Q1, aided in part by lower-than-expected AI costs. While gross margin declined by 100 basis points year-over-year due to higher AI expenses linked to the expansion of its Max subscription tier, the drop was smaller than the 300 basis points the company had initially anticipated. Duolingo did not disclose a specific dollar amount for AI spending, but highlighted that the cost efficiencies contributed to better-than-expected profitability.
Luis von Ahn, CEO and Co-Founder of Duolingo, described AI as “transformational” for education, highlighting its role in rapidly generating personalized content. He emphasized that AI enables Duolingo to offer realistic conversation practice via video calls, and that the future vision includes extending this personalized tutoring beyond language — into math, music, and even chess.
On AI costs, Luis von Ahn acknowledged that most of Duolingo’s AI expenses stem from the OpenAI-powered video call feature in its Max subscription tier. He explained that while these costs could be optimized over time, Duolingo is prioritizing speed in feature development to seize a unique opportunity presented by emerging AI technology.
These strategies translated into standout achievements: daily active users rose 40 percent year-over-year to 47.7 million, paid subscribers grew 37 percent to 10.9 million, subscription revenue surged 46 percent to $210.7 million, and total revenue jumped 41 percent to $252.3 million. Net income climbed 84 percent to $44.8 million, and Adjusted EBITDA margin expanded over four percentage points to 31.2 percent.
Looking ahead, Duolingo is doubling down on AI-driven personalization, intermediate-level learning tools, and subject expansion beyond languages, with full-year 2025 guidance now calling for 36 percent revenue growth and nearly 29 percent EBITDA margin. By embedding AI into product design, content delivery, and monetization, Duolingo has reinforced its position as a leader in scalable, profitable edtech.
Rajani Baburajan
