Duolingo is one of those apps that has become part of the culture. Everyone has a streak, or has had one and lost it, or has been asked by a bird-shaped push notification whether they want to keep it. Whether that same app is actually teaching you a language depends on how honestly you frame the question. The short answer: yes, mostly, up to a point. The long answer is more interesting.
What Duolingo does well
Reducing the friction of daily practice. The single hardest thing about learning a language is coming back to it every day. Duolingo’s whole design — bite-sized lessons, a persistent streak counter, cheerful notifications, a leaderboard — is optimised to get you to open the app one more time. For a habit that most people abandon after two weeks, that is not a trivial contribution.
Vocabulary drilling. If you have never studied the target language before, Duolingo will teach you a couple of thousand common words and phrases in a fun-shaped format that feels less painful than a textbook. For basic tourist competence — reading menus, asking for directions, understanding rough conversation — this is enough.
Listening exposure. Every lesson includes hearing native-speaker audio. Over hundreds of hours of practice, this trains your ear in a way pure reading never will.
Course breadth. Around 40 languages including several with limited resources elsewhere (Navajo, Hawaiian, Scots Gaelic, Welsh, Ukrainian). For niche languages, Duolingo is genuinely one of the best options because so few competitors exist.
The free tier. Fully functional. Ads between lessons and a “hearts” system that limits mistakes, but no core content paywalled behind a subscription.
What it does less well
Grammar. Duolingo explains grammar the way a busy person points at a car and says “that goes.” Some tips exist inside each unit, but they are brief, easy to skip, and not what the app is designed around. If you want to understand why a sentence is constructed the way it is, you will need a separate resource — Anki decks, a proper textbook, or a paid tutor.
Speaking practice. Duolingo’s microphone lessons are useful for pronunciation confidence but nothing like the pressure and improvisation of real conversation. To speak a language you need to speak it with people. Duolingo helps you not embarrass yourself in the first ten seconds; it does not get you to conversational.
Advanced content. Duolingo lessons in most languages plateau around what a serious learner would call B1 — competent but far from fluent. Beyond that, the app has less to teach you.
The gamification. This is a real strength but also a real weakness. Some users end up optimising for streak and XP rather than actual learning — grinding through easy review lessons instead of harder new material, because the reward system pays out either way.
Super Duolingo (the paid tier)
Super Duolingo removes ads, unlocks unlimited “hearts” (so you can make mistakes without being cut off), adds personalised review, and includes some AI conversation practice on select languages.
Worth it if you use the app daily and the ads or hearts system is what breaks your flow. If you tend to open the app a few times a week casually, the free tier is enough.
How to use Duolingo well
The honest advice from long-time users:
- Do the lessons in order the first time through a language. Skipping ahead loses you the vocabulary base.
- Do not chase impossible streaks. A 30-day streak of five-minute lessons teaches you less than a 5-day streak of 30-minute serious sessions.
- Pair it with something else. Podcasts in the target language, a beginner’s grammar book, LangCorrect for writing, or italki for a real teacher. Duolingo is the base layer.
- Do not confuse the streak with progress. If you have a 400-day streak and cannot introduce yourself in the language, the app is not the problem — the metric is.
Who should install it
Install Duolingo if you are curious about a language and want the lowest-friction possible way to see if you enjoy learning it; if you already study a language and want daily vocabulary drilling on the bus; or if you learn best when a small green mascot cheerfully harasses you.
Skip it if you are past intermediate in your target language, or if gamified learning actively annoys you rather than motivates you.
Verdict
4 / 5. The best app for starting, not for finishing. Overpraised by casual users who confuse a streak for progress, and underpraised by serious learners who want to dismiss it entirely. Somewhere between those two positions, honest daily use will genuinely teach you a language — up to about intermediate — and get you into the habit that any further learning will require anyway.