Most "best AI detector" reviews are sponsored listicles. UndetectableTest actually tests the tools: every month we run the same writing samples through popular AI humanizers and score the outputs against five detectors - GPTZero, Originality.ai, Turnitin, ZeroGPT and Copyleaks. Monthly rankings, head-to-head comparisons and per-detector breakdowns. No sponsored rankings - when a vendor update reshuffles the leaderboard, we publish the new numbers.
