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Codewars vs Rustlings: catalog facts
Codewars	Rustlings
Freemium Free to join; Codewars Red is an optional paid subscription.	Free Free and open source.
Web	Windows, macOS, Linux, Command line
Over 55 programming languages supported Solve and test code in the browser	Learn by fixing real compiler errors Runner gives immediate feedback as you edit
Challenge quality varies since kata are community-written Focuses on small exercises rather than larger projects	Requires a Rust toolchain installed first Exercises are short and do not build larger projects
Web application	Downloadable app
Closed source	Open source
License not stated	License: MIT
Account needed	No account needed
Needs internet	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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