My Honest Opinion on Duolingo, After Using It for French, Japanese, and Portuguese

Introduction

Duolingo is, by a wide margin, the most-used language-learning app in the world — reportedly holding somewhere around 90% of the market. I’ve used it myself, for both Japanese at an intermediate level and Portuguese as a complete beginner, for three to four months, including at one point a family subscription I shared with my parents and friends. I’m not a fan of the app overall, but that opinion deserves real detail rather than a blanket dismissal — so here’s my honest, specific take.

A Disclaimer Before Starting

Whatever method you’re currently using, the most important thing is that you actually use it consistently and that you enjoy it enough to keep going. If Duolingo works for you, keep using it — don’t abandon it just because a YouTube video (including this one) says it’s flawed. That said, it’s worth periodically asking yourself whether it’s still serving your actual goals, and being honest with yourself if the answer starts to feel like no.

What Duolingo Genuinely Does Well

It builds the habit of daily practice. This is Duolingo’s clearest strength. Streak counters, daily reminders, and constant notifications are all built specifically to get you back into the app every day — and for anyone who’s never built a study habit before, that daily nudge genuinely teaches something valuable: that consistency, more than any specific method, is what drives real progress. When a complete beginner asks me how to start, I sometimes recommend Duolingo specifically for this reason — to feel, firsthand, how a simple daily counter can build motivation.

It uses spaced repetition. Duolingo incorporates a version of an SRS (spaced repetition system) — the same underlying principle behind tools like Anki, where vocabulary you’ve learned gets resurfaced periodically to lock it into long-term memory. I don’t know the exact algorithm behind it, but new words do reliably reappear in later lessons, which is the core mechanism that makes vocabulary retention work.

Gamification is a real asset, not just decoration. Experience points, leagues, streaks, and social leaderboards genuinely make the app more engaging, and there’s something legitimately similar between language learning and certain video games — both reward small, repetitive daily actions that accumulate into a bigger payoff over time. The social layer specifically — competing with friends, climbing leaderboards — adds a dimension that’s hard to replicate when you’re studying entirely alone, which is otherwise one of the harder parts of self-directed learning.

Audio and text are both present in every lesson. Every exercise combines listening and reading, which is good practice — you need exposure to both. I remember one genuinely strong Portuguese exercise: a full audio dialogue between two people, followed by comprehension questions about what happened in it. That’s closer to real immersion than the app’s typical exercises, and I wish there were more of it.

Where Duolingo Falls Short

It’s too easy, and I don’t think that’s an accident. From a business perspective, Duolingo’s incentive is to keep you engaged and subscribed, not necessarily to make you fluent as efficiently as possible — those two goals aren’t automatically the same thing. A clear example: the word-bank exercises, where you build a translated sentence by tapping pre-provided words in order. Often, you can solve these just by looking at the available words and arranging them into a sentence that makes sense in your own language — without ever really parsing the foreign-language sentence you were supposed to translate. I caught myself doing exactly this in Japanese lessons: answering correctly while barely engaging with the actual Japanese sentence displayed.

There’s little to no explicit grammar instruction. In my experience using it, I don’t recall the app ever laying out a clear grammar explanation — likely because a dense page of grammar theory isn’t fun, and fun is what keeps engagement metrics up. But theory, while genuinely a bit tedious, has real value — especially at an intermediate level, where a specific grammar block can be exactly what’s preventing further progress. I never push students toward memorizing obscure grammar rules for their own sake, but a little theory at the right moment can unlock real comprehension gains that pure repetition doesn’t.

Everything happens out of context. Aside from the rare longer dialogue exercise, almost everything in Duolingo is short, isolated sentences — no sustained text, no extended audio, nothing resembling how language actually gets used. Real speech is messier: people lose their train of thought, restart sentences, trail off. If you’re only trained on short, clean, isolated sentences, native content — full of exactly this kind of natural mess — can feel like a completely different language.

My Overall Verdict

If I had to summarize it in one phrase: Duolingo is a well-intentioned false good idea. The gamification and social features genuinely make you feel like you’re progressing — you level up, complete units, climb leagues — but that feeling of progress doesn’t always match real linguistic development. You’ll build vocabulary, and that part is genuinely useful, but the transition to real, natural language use tends to reveal a gap that the app itself never really addresses.

My Actual Recommendation

For complete beginners with zero existing study habit, Duolingo is a reasonable starting point — specifically to internalize the discipline of practicing daily. Once that habit is established, though, I’d recommend shifting toward more classic immersion: real content, real conversations, and — if useful — dedicated grammar study when you hit a specific blocker. Duolingo can start the engine, but it isn’t built to take you the whole distance.

Conclusion

Duolingo isn’t a bad app, and it isn’t a scam — it does exactly what its business model rewards: keeping you engaged and coming back daily, at the cost of pushing you toward genuinely difficult, high-value practice. That’s a real trade-off, not a flaw invented by critics. Use it if it works for you, especially early on — just stay honest with yourself about whether it’s still moving your actual French forward, or just moving your streak counter forward.