UXsniff is an AI-powered UX analytics tool that automatically detects website UX changes and compares user behavior before and after. It helps product teams understand why metrics move without manually reviewing all sessions. Key features include Change Radar for automatic change detection, Retro A/B for before/after comparisons without planning experiments, Impact Reports that highlight behavioral changes after UX updates, and Rage Alerts that surface sessions with unusual behavior like repeated clicking. UXsniff also includes traditional heatmaps and session recordings as supporting evidence. The tool is lightweight and non-blocking, requiring a simple script installation. It is designed to reduce the time spent guessing when metrics shift, providing decision-ready signals rather than raw data only.