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LeetCode
Top RatedTechnical interview prep. 2,500+ coding problems.
Interview prepContestsDiscussionPremium problems
4.6(125,000)
Free / $35/mo
HackerRank
Coding challenges and hiring. Skills certification.
ChallengesHiringCertificatesMultiple languages
4.5(85,000)
Free / Enterprise
Codewars
Gamified coding challenges. Kata and ranks.
FreeGamificationCommunity katasMultiple languages
4.6(45,000)
Free
Exercism
Free code practice with mentoring. 65 language tracks.
FreeMentoring65 languagesOpen source
4.7(25,000)
Free
CodeSignal
Technical assessment platform. Coding tests and interviews.
AssessmentsIDEScoringHiring
4.5(18,000)
Free / Enterprise