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Exercism vs Codewars: catalog facts
Exercism	Codewars
Free Free to use.	Freemium Free to join; Codewars Red is an optional paid subscription.
Web	Web
Exercises in dozens of programming languages Optional feedback from mentors	Over 55 programming languages supported Solve and test code in the browser
Mentor availability can vary by language Focused on practice exercises rather than full courses	Challenge quality varies since kata are community-written Focuses on small exercises rather than larger projects
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.