Exercism review

Exercism is the place to practice once you have written your first lines of code. It offers over 8,953 coding exercises across 85 language tracks, from Python and JavaScript to Rust and Go, and its in-browser editor supports all 85 languages, so you do not need to install anything to start. Every solution gets automated analysis, and you can request free human mentoring to learn the conventions of a language. Advanced users can solve exercises locally through the CLI. Exercism describes itself as 100% free, forever, and is a not-for-profit registered in the UK. It is less suited to absolute beginners: the site points first-time coders to its separate Jiki platform, and there is no mobile app. Mentoring also depends on volunteers. We compared documented features and published prices; we did not take the courses.

Who it is for

learners who know the basics and want practice with feedback

Price

Free: 100% free, forever.

Exercism is fun, effective and 100% free, forever.
Quoted from the vendor pricing page on November 12, 2026.

Key features

• Over 8,953 coding exercises across 85 language tracks
• In-browser editor that supports all 85 languages
• Automated analysis of every solution
• Free human mentoring on exercises
• CLI for solving exercises locally

Strengths and weaknesses

• Strength: 100% free, forever, run by a not-for-profit
• Strength: Free mentoring from volunteers on any track
• Strength: Python track alone lists 854,396 students
• Weakness: Built for practice, not first lessons; Exercism points absolute beginners to Jiki
• Weakness: No mobile app is listed
• Weakness: Mentoring depends on volunteer availability

Key facts

• Price: $0
• Languages: 85
• Exercises: Over 8,953
• Mentoring: Free, human
• Organization: Not-for-profit, registered in the UK

Where it ranks

Exercism is No. 7 in our Best Learn To Code Apps verdict.