Duolingo
Excellent at building a daily practice habit and early vocabulary, less effective at getting you to real conversational fluency alone.
Pros
- Gamified streaks make daily practice genuinely stick
- Free tier is fully usable without ads becoming disruptive
- Bite-sized lessons fit into short pockets of downtime
Cons
- Speaking and listening practice lags behind vocabulary drilling
- Progress can plateau past an early-intermediate level
What we tested
Two reviewers used Duolingo daily for ten weeks on different target languages, tracking streak retention, lesson variety, and how the material held up against a placement test from an independent language school at the end of the period.
What works
The habit-loop design is the best in its category — streaks, gentle notifications, and short lessons make daily practice easy to sustain, which matters more for language learning than any single feature. Vocabulary acquisition in the early stages was solid, and the free tier remains genuinely usable rather than a crippled trial.
What’s missing
Both reviewers plateaued around an early-intermediate level, and the placement test result was noticeably weaker in speaking and unscripted listening than in reading and vocabulary — consistent with Duolingo’s own published research showing the app is strongest as a starting point, not a complete method.
Verdict
A strong, low-cost way to build a daily language habit and early vocabulary. Plan to pair it with conversation practice once you’re past the beginner stage.