Duolingo's AI Pivot Sparks User Backlash and Stock Decline

The language-learning platform Duolingo announced an "AI-first" strategy in April 2025, with CEO Luis von Ahn declaring the company would scale content using artificial intelligence and not "miss the moment" of the technology. The move triggered immediate user backlash and contributed to the company's stock price plummeting from its all-time high of $540 per share in May 2025, down 80% from its peak as of April 24, 2026.

According to reporting from The Reynolds Center for Business Journalism, paying subscribers complained about worsened lesson quality and threatened to cancel subscriptions. One user posted on Reddit that the content turned into "AI slop" and that Duolingo's pivot to AI "really kills it."

Users who paid for premium access noticed the difference immediately. The familiar green owl mascot still greeted them, but the lesson structure felt different—more generic, less polished, with explanations that sometimes missed the mark on grammar nuances. The physical act of tapping through exercises became less satisfying when the feedback loop felt automated rather than crafted.

Von Ahn has since walked back his initial statement, emphasizing that the company is using AI to "accelerate what we do, at the same or better level of quality" without replacing employees. In an interview on the Silicon Valley Girl podcast in April 2026, he acknowledged the feedback from employees who began asking if Duolingo just wanted them to use AI for AI's sake (a question that probably shouldn't have been asked in the first place).

"At the end, we backtracked, and we said, 'No. Look, the most important thing in your performance is that you are doing whatever your job is as well as possible. A lot of times AI can help you with that. But if it can't, I'm not going to force you to do that,'" von Ahn told Fortune.

The company rolled out Duo Max, a $30-per-month plan that promises personalized language learning powered by OpenAI's GPT-4, with functions like explaining answers and AI-enabled video roleplay. However, the pricing creates an obvious friction point: a motivated learner could theoretically subscribe to a $20 premium ChatGPT plan instead, bypassing Duolingo entirely while still enjoying an AI-enhanced learning experience.

"I think Duolingo is going to have to be competing with these other companies," said Eric Jackson, who teaches the Human Language Technology program at the University of Arizona's linguistics department. "For the languages where it works well, the product feels like it's going to be very equivalent from a learner's perspective."

But Jackson also cautioned that most of the world's languages are likely underrepresented in AI model training data, which could lead to lower-quality outputs for less commonly spoken languages. ChatGPT might be able to help someone learn French more accurately than Estonian, for instance.

Here, Duolingo's advantage could be in "artisanal" data involving humans actively designing course content. The platform currently offers over 40 languages, including less frequently taught ones like Welsh, Catalan and Haitian Creole.

Financial documents tell a different story than the optimistic public statements. Even as Duolingo touted its integration of AI to the platform in its 2025 annual report filed with the U.S. Securities and Exchange Commission, the same report notes an extra $3.6 million investment in generative AI that contributed to the company's 30% increase in research and development spending.

"Our costs are continuing to grow, and some of our investments have the effect of reducing our operating margin and profitability," the filing states. "If our investments are not successful, our business and financial performance could be harmed."

Von Ahn struck an optimistic tone in the first quarter earnings call of 2026 on May 4, playing down the costs of AI investment and emphasizing its role in user experience and producing content for Duolingo. He noted that AI helped Duolingo create 10 times more course units than two years prior.

"AI has fundamentally changed what's possible for us," he said. "I believe we're just scratching the surface."

The company's own blog post on AI in education frames responsibility as "custodianship"—an ongoing practice of care, guidance, accountability, and reflection over time. This framing matters because education is not a single domain with a single set of values. It is cross-disciplinary, culturally situated, and global.

Whether users actually pay for the AI-enhanced experience remains the real question. The stock price tells one story, the SEC filing tells another, and the user complaints tell a third. Duolingo did not comment at the time of publication, which probably says something about their current mood.

Artūras Malašauskas is an AI Systems Integrator with 20+ years of production-grade web engineering experience. He has designed, shipped, and scaled enterprise Python/PHP systems for logistics, SaaS, and public-sector clients. For the past year, he has focused exclusively on AI integrations: deploying open-source LLMs, building generative media pipelines (image, audio, video), and engineering multi-agent workflows for real production environments. His standard: reproducibility, security, cost-efficient inference—no vaporware. He documents and evaluates emerging AI tooling, separating verified capabilities from marketing noise. Technical editor at: muza-ai.eu, ai-verslas.lt, ai-naujinos.lt Connect on LinkedIn