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


Kaairo is described as 'AI is an AI-powered talent assessment platform that helps organizations evaluate candidates and employees through competency-based assessments. Each test type creates custom content and is automatically scored against organization-specific competency frameworks' and is an website in the office & productivity category. There are four alternatives to Kaairo, not only websites but also apps for a variety of platforms, including Chrome OS, Mac, Windows and SaaS apps. The best Kaairo alternative is HackerRank. It's not free, so if you're looking for a free alternative, you could try HackerRank. Other great sites and apps similar to Kaairo are iMocha and Mettl.
A fun social platform for hackers to solve interesting puzzles, build quick hacks, code game bots and collaborate to solve real-world challenges.


Codejudge Assessment Suite is the best-in-class developer evaluation platform powered with real-world tech assessments. Codejudge enables recruiters to create custom tests on a plethora of skills and tech roles.




iMocha is a skills intelligence and assessment platform that enables talent teams to make smarter talent decisions. With the world’s largest skill assessment library for 2500+ skills, iMocha helps organizations to make intelligent talent decisions.

Mercer Mettl is a leading Online Assessment Platform, and one of the fastest growing Talent Assessment, Online Examination & Certification Platform.