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

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