Duolingo is facing a legal battle over whether its recent updates have hurt its educational value. The language-learning app is used by millions of children and students worldwide. Now, a class-action lawsuit alleges that the company degraded its user experience to push aggressive monetization and low-quality, AI-generated lessons. For parents and educators, these allegations show a conflict between student learning and corporate profits.
What Happened
In October 2026, investors filed a securities class-action lawsuit against Duolingo in Pennsylvania federal court, according to the legal announcement by Robbins Geller Rudman & Dowd LLP. The lawsuit, City of Dearborn Heights Act 345 Police & Fire Retirement System v. Duolingo, Inc., claims the company hid how its monetization strategies hurt daily active user growth. As detailed in InvestLin's coverage of the pension fund suit, the complaint alleges that Duolingo introduced "user friction" to force free users into paid subscriptions. For example, the app replaced its traditional "Hearts" mechanic with an "Energy" system in April 2025. This new system took away energy even when users answered questions correctly. The lawsuit argues this setup frustrated students, causing them to break their streaks and delete the app.
Tech analyst Anurag Wagh has argued that Duolingo's business model works without ruining the free experience. The lawsuit disputes this. It claims Duolingo's internal A/B testing showed that increased friction and unskippable ads drove free users away, even while executives publicly claimed user momentum was strong.
The Bigger Picture
The lawsuit also raises concerns about product quality after Duolingo shifted toward artificial intelligence. A timeline by ToolsAI shows that Duolingo laid off many contractors, including human translators, linguists, and course designers, in April 2025 to build an "AI-first" curriculum. Company executives argued that AI would personalize and improve lessons. Critics countered that removing human experts hurt the quality and accuracy of the language courses.
Academic research supports these concerns. Studies on beginning-level Duolingo courses and gamified reading in EFL classrooms show that gamified apps help with initial motivation but often fail to build lasting language skills. A 2026 study in the Exa Library database compared a Duolingo program to other AI-driven learning tools. The researchers found that while Duolingo helped with short-term vocabulary, it offered no long-term advantage over traditional teaching methods. In contrast, learning programs that used contextualized lessons led to much better retention and real-world application.
This lack of long-term retention fits what we know about early development. As we previously reported, real learning requires a foundation of spoken language and real-world interaction. Automated, rapid-fire drills struggle to replicate these elements.
What This Means for Families
For families and schools, Duolingo is looking less like a learning tool and more like a high-pressure digital game. When an app limits a child's sessions or floods them with ads to force a paid upgrade, it hurts their focus and the quality of their screen time. If automated AI content has lowered lesson quality, students might spend hours keeping their streaks alive without actually learning grammar or vocabulary.
What You Can Do
Parents can start by checking on their child's screen time. If a child feels anxious about losing a streak or gets frustrated by sudden paywalls and aggressive ads, it might be time to take a break from the app.
To build real language skills, balance app use with offline practice. Reading books, listening to music, and practicing conversations provide the real-world exposure that gamified apps struggle to deliver.
Finally, consider looking for other learning tools. Programs that focus on contextualized vocabulary and active assessment often work better than repetitive drills.