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Duolingo makes a phone app that teaches people languages through short, game-like lessons.
Duolingo is a learning company built around one very popular app. You open it, tap through quick lessons that feel more like a game than homework, and earn points and streaks for practicing a language. The whole thing is designed to be fun enough that you keep coming back, which is the hard part of teaching yourself anything.
Most people use it for free, and that is on purpose. The free version shows ads, and those ads bring in money. The bigger business is Duolingo Super, a paid subscription that removes the ads and adds extras, plus a higher tier called Max that uses AI to explain mistakes and let you practice talking. People pay because the free app is good enough to build a habit, and once the habit sticks, paying a few dollars a month to skip ads and unlock more feels easy. The company's real magic is its data and its mascot. Hundreds of millions of people use the app, so it can test which lessons work and tune the difficulty constantly. Its owl mascot and its habit of poking fun at its own users on social media keep it in the conversation, which means it spends far less on marketing than most apps its size. The risk is that language learning is a crowded field, with free tools from Google and others, and that AI tutors could change the game. Still, Duolingo grew revenue roughly 40% in 2024 to about $748 million and turned a profit, showing the free-to-paid funnel actually works.
Luis von Ahn grew up in Guatemala, where learning English was expensive for people in his community. So he and his student Severin Hacker started working on a way to make it free. They thought about running it as a nonprofit, but von Ahn decided that model could not last, and the business would be paid for by subscriptions and ads.
The two men founded Duolingo at Carnegie Mellon University in Pittsburgh. Investors believed in the idea early: Union Square Ventures led a small first round of funding that year.
After a test version of the app, Duolingo opened its doors to everyone in June. What began as a private beta was now a product anyone could download and use.
By now the free language app had become huge. Alphabet's investment arm put in $30 million, valuing the company at $1.5 billion, with 30 million active users and only a couple hundred employees. Free education was becoming a big business.
The company filed papers to sell shares on Nasdaq under the ticker DUOL. A month later it did just that, turning a professor's classroom dream into a public company.
Duolingo redesigned its app, replacing the tree-like course structure with a straight line you move along. Users hated it. But CEO Luis von Ahn said the company had no plans to reverse the change, and it stayed.
Duolingo launched Max, a higher-priced subscription tier built on GPT-4. It added AI features like explaining why an answer was wrong and roleplay conversations, showing how central AI would become to the product.
Von Ahn announced an "AI First" strategy, and users read it as replacing the human touch with machines. The anger was immediate. Then came GPT-5, which let anyone build a homemade language tutor with a chatbot, so Duolingo's biggest competitor was suddenly conversational AI itself. By late in the year the stock had fallen 64% from its May peak, even though 135 million people were using the app every month.
Quarterly results showed daily user growth slowing sharply from where it began the year, and the company reversed its push to squeeze more money from users in order to grow again. Investors were spooked, and the stock dropped 25% in a day.
The year-end results confirmed the slowdown, with guidance for slower growth and lower profit in the year ahead. Von Ahn admitted the company had deliberately made the free experience worse during its money-making push. The stock fell another 14%, and a securities class action later accused executives of hiding how aggressive ads and low-quality AI content had hurt user growth.
With the company under pressure, the founders handed the CEO role to Gillian Munson. For the first time in its entire history, Duolingo would be led by someone other than Luis von Ahn.
What makes it interesting is that Duolingo is really a habit machine dressed up as a language school. It does not sell certificates or promise fluency. It sells the daily streak, the little green owl, and the feeling of progress. That is a much cheaper product to run than a school, and it scales to almost anyone with a phone.
Saved answer · last researched 21 Oct 2026