Free Screen, Dead Pixel & Monitor Refresh Rate Hz Tester
The FastestChecker Screen Tester audits monitor refresh rate (Hz), detects dead and stuck sub-pixels with full-screen RGB sweeps, and tests color banding directly in your browser without software installation.
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How Monitor Refresh Rate (Hz) & Dead Pixel Testing Works
Last updated & verified: October 2026 by Muhammad Asad Arshad, Lead Systems Architect
Your monitor's refresh rate dictates how many individual images your display paints to the screen each second. FastestChecker connects directly to your GPU vertical synchronization clock via the HTML5 requestAnimationFrame API to measure true hardware refresh rate in real-time.
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