💻 Coding · 🎓 Courses and learning platforms
Exercism
By Exercism (UK not-for-profit). Visit Exercism
Desk research from the maker's own pages. Not yet tried by us. Checked 2026-10-24.
A free practice site with over 8,000 coding exercises across about 85 programming languages. Learners solve small problems in the browser or on their own computer, run tests, and can ask a volunteer mentor for a code review. Learning tracks teach language concepts step by step. It suits learners who already know some programming and want fluency in a new language; the maker now points beginners to a separate site called Jiki.
Our take: Good for teens who already code and want practice and feedback; beginners and younger kids should look elsewhere.
| Ages it suits | 13+ (16+ in the UK and EU) |
|---|---|
| What its terms say about age | Terms: you must be at least 13 to use the platform, or at least 16 in the UK or EU; younger users may not use it or post personal information. (terms) |
| Price | Free. Free (Oct 2026). Insiders (donate $10 a month or more, or earn it through contributions) removes ads and adds AI feedback and other perks. |
| Works on | Web, Windows, Mac |
| Account | The child's own account |
| Ads | Yes |
| In-app purchases | None |
| The AI in it | "Exercism AI" feedback is a perk for paying Insiders; the free tier relies on automated tests and human mentors. |
What's good
- Free practice in dozens of languages
- Human mentor code reviews
- Tests show right away whether code works
- Non-profit
Watch for
- 13+ (16+ in UK/EU) only
- Mentoring is one-to-one with adult volunteers
- Ads unless you donate
- Not for true beginners
Data and privacy
Says it collects only what it needs and will not share your data with other third parties; uses Google Analytics and Hotjar for usage tracking. Read the privacy policy.
Does it work?
No independent studies; the maker shares community numbers.
In the Big Index
- On the list 23 best free online courses for teens
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Where these facts come from
- https://exercism.org/
- https://exercism.org/insiders
- https://exercism.org/docs/using/legal/terms-of-service
- https://exercism.org/docs/using/legal/privacy-policy
Prices, terms and features change. Nobody paid to be listed, nothing here is an affiliate link, and Peabody never rates itself. Where we and the maker disagree, the maker's own pages are the ones to trust.