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July 2026
Free tier available
Learning
What we checked ourselves
Not copied from the project's own blurb. These are things we opened and verified, with the date.
- 12 Sept 2026We checked that the link to the project still resolves.
Where this sits among the 38 tools we list in Learning
- Works without using a terminal30 of 38
- No API key required30 of 38
- Runs on a phone alone14 of 38
- Sends your input to the provider13 that do not →
Only 14 of the 38 meet all of the conditions above.
Counted from our own checks: every tool we list is examined against the same criteria.
What it does
Daily streaks and bite-size lessons, plus AI roleplay conversations on paid plans.
Summary based on the project's own description. The Japanese page has a fuller beginner guide: setup difficulty, what to prepare, and a step-by-step start.
Screenshots & visuals
Before you start
- Setup difficultyEasy to start
- Command lineNot required
- API keyNot required
- Sends data onlineYes
Judged automatically from the project's own metadata. Always confirm on the official page.
Duolingo FAQ
- Is Duolingo free?
- The source is open, but the build distributed through the app store may be a paid download. Check the store listing before installing.
- Do I need to install anything or write code to use Duolingo?
- No install needed — it runs in the browser.
- Does Duolingo work on a phone?
- Yes, it works on a phone.
- Can I use Duolingo commercially?
- We could not confirm this. The page shows 商用サービス, but we have not verified whether what you make with it may be used commercially. Ask the publisher before relying on it.
How it compares
The conditions that decide whether you can actually use it, side by side.
| Tool | Command line | API key | Sends data out | Phone | Commercial use |
|---|---|---|---|---|---|
| Duolingo (this page) | Not needed | Not needed | Yes | Yes | Not verified |
| Quizlet | Not needed | Not needed | Yes | Yes | Not verified |
| Mr.-Ranedeer-AI-Tutor | Not needed | Not needed | No | No | Not verified |
| Anki-Android | Not needed | Not needed | No | Yes | Yes |
"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.