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

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