Codewars
Ranked coding exercises in 55+ languages, with community solutions
Codewars is a practice site built around short coding exercises called kata. You choose a kata, write a solution in the browser and run it against test cases. When you pass, you can compare your code with other people's solutions and talk about different approaches.
Free · Login needed · Browser · Beginner
About Codewars
Kata have difficulty ranks, and solving harder ones raises your own rank. More than 55 languages are supported, so you can use it to learn a new language or keep your skills sharp. Users can also write and review new kata.
It covers everyone from beginners to experts. You need an account to train. A paid plan called Codewars Red adds extras such as more statistics and no ads.
On Breakpoint since 23 Oct 2026.