A federal class-action lawsuit against Duolingo claims the company intentionally lowered the quality of its language app to boost ad revenue and force users into paid subscriptions. For parents and educators who rely on the tool, the legal challenge points to growing concerns over automated errors and aggressive monetization. The case sparks a debate about the educational value of gamified learning apps that rely on artificial intelligence instead of human teachers.
What Happened
According to the class-action complaint filed in federal court, Duolingo executives allegedly misled the public about the sources of daily active user growth. The lawsuit claims Duolingo deliberately added user friction to the free tier, which included drastically increasing unskippable ad volume and pushing subscription upsells. Executives reportedly knew this friction would frustrate users and degrade the platform.
The lawsuit also alleges that Duolingo's transition to rapidly generated AI content worsened the quality of its language lessons. As we previously reported, the platform laid off human contractors and curriculum designers in late April 2025, replacing them with generative AI. This shift reportedly resulted in a surge of translation errors and unhelpful automated responses that disrupt student learning.
The Bigger Picture
The shift from human-designed curricula to automated AI lessons goes beyond simple software bugs. Educational researchers point out that language learning platforms using AI require human validation to remain effective. Without human oversight, automated platforms can reinforce incorrect habits. A study in the journal PLOS One warns that reliance on generative AI tools can lead to "competence narrowing," which limits a student's ability to communicate in real-world scenarios.
At the same time, the changes to the free tier create administrative hurdles. Educators face disruption because Duolingo plans to permanently discontinue its free Duolingo for Schools dashboard on July 31, 2027. This classroom tool, which allowed teachers to track student progress, is being retired due to low usage. Teachers must prepare to migrate to alternative language-learning platforms before the cutoff.
What This Means for Families
For families using the free version, these changes disrupt the learning environment. According to reviews on Android Authority, the app is bloated with non-educational features, including partnerships with mobile games like Brawl Stars that encourage children to play games to earn app rewards.
The user experience is also bogged down by mechanics designed to limit continuous study. The platform’s "Hearts" or "Energy" mechanics force users to stop studying or watch ads once they run out of energy. These unskippable ads and promotional pop-ups often force children to spend as much time watching commercials as they do learning, which increases non-educational screen time and causes cognitive fatigue.
Some educational benefits remain. Classroom studies show that using the app increases student enjoyment and self-regulated learning. However, parents and teachers must balance these benefits against the rising commercialization and declining accuracy of the lessons.
What You Can Do
Parents can take several steps to mitigate these issues. First, they can help children bypass ads and energy limits by having them access Duolingo through a web browser instead of the mobile app, as the web version does not enforce the same restrictive energy rules. To address potential "competence narrowing" from AI lessons, families should supplement the app with human-led conversation practice. Reading bilingual books or speaking with fluent family members can help reinforce natural speech. Parents should also actively monitor lessons for automated translation or pronunciation errors, teaching children to question answers that seem incorrect.
Meanwhile, language teachers who rely on the classroom dashboard need to start evaluating alternative language tools for schools now. Planning these transitions early will ensure a smooth change before the educator platform shuts down in July 2027.