CodeChef
Solve contest problems weekly and earn a star rating
CodeChef hosts programming contests and practice problems. You solve problems in the browser and submit code that is judged right away. There are weekly contests and practice problems sorted by difficulty, plus courses on languages and data structures.
Free · Login needed · Browser · Beginner
About CodeChef
It trains algorithm skills for competitive programming. Your contest results give you a rating shown as one to five stars, and a guided roadmap aims to move you up. It suits beginners as well as experienced contest players.
You need a free account. The free plan includes weekly contests, practice paths and some course content. A paid Pro plan adds all courses, an AI mentor and certificates. CodeChef is based in Bengaluru, India.
On Breakpoint since 23 Oct 2026.