The Best 16 CheckIO Alternatives

  • CodinGame

    CodinGame is a challenge-based training platform for programmers where you can play with the hottest programming topics.

    Free Web

  • hackerrank.com

    A fun social platform for hackers to solve interesting puzzles, build quick hacks, code game bots and collaborate to solve real-world challenges.

    Free Web

  • CodeFights

    Duel with friends and foes in head-to-head programming battles!.

    Free Personal Web

  • exercism

    Download and solve practice problems in over 30 different languages. For code newbies and experienced programmers.

    Free Open Source Web Terminal

  • Codewars

    Achieve code mastery through challenge. Improve your skills by training with others on real code challenges Kata In our dojo, kata are real code challenges...

    Free Self-Hosted

  • Kattis

    Kattis helps companies make safer recruitments and attract the best developers with its dynamic challenge platform. With Kattis companies make sure developers make...

    Commercial Web

  • Codeeval

    CodeEval is platform for hosting coding challenges which has over 20,000+ competitive developers.

    Free Web

  • Geektastic

    Unique peer-reviewed code challenges for deep insight into candidate's technical skills and abilities.

    Commercial Windows iPhone Chrome OS

  • Code Arcade

    built by codefights, code arcade challenges players to solve programming tasks to complete game levels. it's a fun way to hone...

    Free Web

  • Vim Adventures

    VIM Adventures is an online game based on VIM's keyboard shortcuts (commands, motions and operators). It's the "Zelda meets text editing" game.

    Commercial Web

  • Screeps

    Learn to code JavaScript by playing game. This game claims to be the world’s first MMO strategy sandbox game for programmers.

    Commercial

  • Ruby Warrior

    This version of Ruby Warrior is a project by Bloc, a part-time online coding bootcamp for people who want to keep their current job, learn how to code, and become a...

    Free Personal Web

  • Hackerearth

    a social and community platform for students and developers for solving programming puzzles, sharing notes and practicing concepts with the online editor, live...

    Free Web