The best alternatives to Codewars are hackattic, Velocity, and SolveFaction. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Codewars?
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hackattic is an attempt to show people that programming challenges right now are DULL, lack creativity and are a sad way to estimate someone's skills. It's a very, very early phase, hacked up over a few lazy weekends, which the simple intention of making step zero out of possibly many to come.
With SolveFaction you sharpen your coding challenge game by playing and competing on mobile. Stay ready for future job interviews, expand your knowledge, and have fun climbing the leaderboard.
Devpad.io helps conduct the coding interview and the training session. Powerful and efficient solutions: pads, repos, reviews, containers and more. Coding interview tools for screening and testing developers.