Monitor Refresh Rate Test

Check if your monitor is actually running at its rated refresh rate (60Hz, 144Hz, 240Hz). Verify visual sync and detect screen tearing instantly in your browser.

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Technical Audit

This utility is a high-performance diagnostic node optimized for modern browser environments. All data processing is evaluated locally without requiring heavy external plugins.

Hardware Detection: Accurately measures your current running refresh rate by measuring frame-paint deltas.
UFO Tracking Animation: Moving blocks at varying framerates to visually test screen tearing vs smooth sync.
Client-Side Only: Processes data completely in your browser without server lag.
Multi-Monitor Support: Drag this tab between screens to see real-time refresh rate recalibration.

System FAQ

How do I check my monitor's refresh rate online?

Open this page and the tool will automatically measure your display's actual refresh rate using requestAnimationFrame timing. It shows your real Hz in real-time.

I have a 144Hz monitor but it shows 60Hz — why?

Your OS defaults to 60Hz even on high-refresh monitors. Fix it by going to Windows Settings → Display → Advanced Display Settings → Refresh Rate, then select 144Hz.

What is the difference between 60Hz and 144Hz?

A 60Hz monitor refreshes 60 times per second, while 144Hz refreshes 144 times. Higher Hz means smoother motion, especially noticeable in fast games and scrolling. The difference is visually significant.

Does a higher refresh rate reduce eye strain?

Yes. Higher refresh rates reduce the perceived flicker, which many users find reduces eye fatigue during long sessions. 144Hz is recommended for extended computer use.

Why does the lower-framerate block look choppy?

When a block moves at 30fps on a 60Hz screen, each frame is displayed twice. Your eye's smooth pursuit tracking fails, causing visible stutter. This demonstrates the real-world impact of low framerates.

What is screen tearing?

Screen tearing happens when your GPU sends frames faster than the monitor can refresh, causing visible horizontal splits in the image. V-Sync, G-Sync, and FreeSync all fix this by syncing GPU and monitor.