Codility vs. CodeSignal

Codility is a technical and AI skills assessment platform built on documented assessment science. For almost two decades it has helped engineering and talent teams answer one question with evidence: who can actually do the work. Every task is designed by occupational psychologists, mapped to the Codility Engineering Skills Model, and monitored for adverse impact at every measured cut score. When a result is challenged, the methodology behind it is documented and reviewable. Three products run on that foundation. Screen delivers standardized early technical signal at scale.

CodeSignal is the AI-native skills assessment and intelligence platform that shows you who can actually do the job, not just who interviews well. Whether you're making your first hire or your thousandth, our platform brings together skills assessments, work simulations, AI Interviewers, and live technical interviews, giving every candidate a realistic way to show what they can do. Cosmo, our built-in AI assistant, gets you hiring in minutes. Each assessment and interview results in a detailed skills report, giving you the proof behind every hiring decision.