The full review
What is Duolingo?
At its core, Duolingo is a gamified language app that breaks study into short exercises you can finish during a coffee break. The company positions the product as free, fun and effective, and the public course catalog backs the breadth claim: well over a hundred courses covering Spanish, Japanese and Arabic alongside Navajo, Hawaiian, Scottish Gaelic and even High Valyrian.
It runs in a desktop web browser and as iOS and Android apps. A cartoon owl named Duo supplies the reminders, while points, unit levels and league standings turn each session into a small scoreboard. The public course catalog lists a learner count beside each course, such as 42M for Spanish and 22.8M for French.
How the daily lesson loop works
A Duolingo lesson mixes reading, listening, writing and short speaking prompts. Mistakes cost Hearts, which act as the free tier soft limit on how long you can push in one sitting. Personalized Practice then rebuilds your errors into a targeted review lesson, and Legendary challenges let you take a finished unit to mastery.
The retention machinery is the other half of the product. Streaks, leaderboards and weekly leagues supply the reason to come back on a day you would rather not. That gamification is why Duolingo works for people who have abandoned textbooks, and why serious students sometimes find it thin.
Beyond language courses
Duolingo has quietly become a general learning app. The catalog now includes Math, Music (listed as iOS and Android only) and a full Chess course, where a bot named Oscar is trained on real matches to play like a human opponent, puzzles teach tactics one idea at a time, and realtime games pair you against other learners at your level.
What a Super subscription unlocks
The free tier is genuinely usable. Super Duolingo removes ads, switches on Unlimited Hearts so mistakes stop gating your session, and adds Personalized Practice plus unlimited attempts at Legendary challenges. A Family Plan shares all the benefits of Super Duolingo with 5 of your family and friends, the sensible option for a household learning together.
Duolingo Max sits above Super and layers on AI features: Roleplay, which drops you into real-world scenarios with in-app characters and returns feedback on accuracy and complexity, and Video Call with Lily, a partner that responds in real time and hands you a transcript afterwards. The homepage advertises a one week free trial.
Duolingo in the classroom
Teachers get Duolingo for Schools, a free management layer that maps the curriculum to ACTFL and CEFR standards, pushes adaptive assignments and reports student accuracy and time spent. One caveat before building a syllabus around it: a banner on the schools site states the program will be sunset on July 31, 2027.
Evidence the vendor points to
Duolingo runs a public efficacy program rather than leaving results to reviews. The vendor reports that five sections of its French or Spanish course cover roughly five university semesters of material, that Japanese learners of English improved speaking after a month of Video Call in Max, and that its learners scored higher on language tests in 2024 than in 2023 or 2020. Treat these as company research: useful, not independent.
Who should choose Duolingo
Pick it if you are starting a language from zero, restarting one you dropped, prepping for travel, or you simply need a habit that survives busy weeks. The breadth is unmatched, the free tier is real, and Super or Max remove the friction once a streak starts to matter. Households should look straight at the Family Plan.
It is not the right tool for someone who needs conversational fluency on a deadline, deep grammar instruction, or advanced work beyond the intermediate plateau, where most learners outgrow the path and need tutors, immersion or a structured textbook. Treat it as the daily engine, not the whole curriculum.
Strengths
- Best-in-class free tier — all 40+ courses accessible without paying
- Excellent gamification (streaks, leagues) that drives real daily consistency
- Very low cost relative to competitors, especially the 6-person Family plan
- Polished, low-friction mobile apps with bite-sized lessons anyone can start
Watch out for
- Optimizes for engagement over fluency — weak on real conversation and grammar depth
- AI 'Max' features are limited to high-traffic languages (Spanish, French) and thin value
- The energy/hearts system gates free practice and pressures upgrades
- Course quality drops sharply outside the most popular languages
Key features
| Feature | What it does |
|---|
| Gamified daily lessons | Streaks, XP, leagues and bite-sized exercises engineered to build a daily learning habit. |
| 40+ language courses | Broad catalog from Spanish and French to Welsh, Navajo and High Valyrian, all free to access. |
| AI features (Max tier) | Video Call with 'Lily', Roleplay conversation practice and AI explanations — best in Spanish/French. |
| Personalized review & unlimited energy | Super removes ads and the hearts limit and surfaces targeted practice of your past mistakes. |
How Duolingo compares
| Alternative | How it differs |
|---|
| Babbel | More structured, conversation-focused lessons; stronger for grammar and real dialogue, but paid-only. |
| Busuu | Community feedback from native speakers plus a solid free tier; good middle ground. |
| Rosetta Stone | Immersion-based, speech-recognition heavy; premium price and dated feel but proven method. |
Frequently asked questions
Is Duolingo really free?
Yes. The free tier gives full access to all 40+ courses; you only pay to remove ads, lift the energy/hearts limit, or add AI conversation features.
Is Super or Max worth paying for?
Super is worth it if ads and the energy system annoy you or you want offline lessons. Max is hard to justify — its AI features are limited to a few languages and some have since moved to the free tier.
Duolingo ratings on other platforms
Independent user ratings from third-party review sites, linked here for transparency.
These are not our editorial score, are captured on the date shown, and may have changed since.