Duolingo has become a daily habit for millions of people around the world, built on a simple formula of being good, free and fun.
The language-learning app offers short lessons that can be completed in a few minutes, making it easy for users to fit practice into busy routines.
Its design borrows heavily from games, with points, levels, leaderboards and daily streaks that reward users for returning. Push notifications and reminders gently nudge users who have not completed their daily lesson.
“The genius is not in any single lesson but in getting people to come back tomorrow, and the day after.”
Educators say this approach can help learners build consistency, which is often the hardest part of picking up a new language.
“The genius is not in any single lesson but in getting people to come back tomorrow,” said one education technology researcher.
A free tier has helped the app reach a broad audience, while optional paid subscriptions remove adverts and add extra features.
Its green owl mascot has become a recognisable presence on social media, where playful marketing has helped the brand connect with younger users.
The company has also expanded beyond languages into subjects such as mathematics and music, applying the same bite-sized, game-like approach. Analysts say diversifying its offer could help it retain users who finish a language course.
Some language teachers caution that app-based practice works best alongside conversation and other forms of study, rather than as a complete replacement.
As competition grows from other apps and AI-powered tutors, the challenge will be keeping lessons engaging while showing that they lead to real progress.
