Refresh Rate Tester
Measure your display refresh rate in the browser using requestAnimationFrame frame timing. Detects 60, 75, 120, 144, 165, and 240 Hz modes - no install required.
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What is Refresh Rate Tester?
The Refresh Rate Tester estimates how many frames per second your display actually shows by recording requestAnimationFrame timestamps for about two seconds and taking the median frame interval. It snaps the estimate to common rates like 60, 120, 144, and 240 Hz and shows the min-max frame range so drops are visible.
Key Benefits
- Verify the high-refresh mode you paid for is actually running
- Detects 60, 75, 90, 120, 144, 165, and 240 Hz modes automatically
- Median-based math resists one-off stutters and jank
- Nothing to install - runs in any modern browser
Common Use Cases
- •Confirming 120/144/240 Hz is enabled after a monitor or cable upgrade
- •Checking whether a laptop drops to 60 Hz on battery
- •Diagnosing stutter caused by apps stealing frame time
- •Verifying phone or tablet high-refresh panels in mobile browsers
- •Sanity-checking VRR and driver settings after changes
Test Your Display Refresh Rate
- Keep this tab in the foreground: Browsers pause frame rendering for background tabs, so bring this tab to the front and avoid moving the mouse heavily during the test.
- Start measuring: Click Start measuring. The tool collects requestAnimationFrame timestamps for about two seconds - around 120 to 500 frames depending on your display.
- Read the result: The median frame interval converts to Hz, snapped to the nearest common rate such as 60, 120, 144, or 240 when it matches.
- Cross-check the range: If the min-max range is wide or far below the rated Hz, close heavy apps, enable the high-refresh mode in your OS settings, and measure again.
Key Features
- Median-based estimate from roughly two seconds of frame timing
- Snaps to common rates: 60, 75, 90, 120, 144, 165, and 240 Hz
- Shows min-max frame range so drops and judder are visible
- Live frame counter while measuring
- Warns when the tab is hidden and frames are paused
- Works entirely in the browser - no drivers or software install