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240Hz Test — Confirm a 240 Hz Esports Display

Measure the refresh rate your browser really renders: a live Hz readout from frame timestamps, a frame-time graph, a skipped-frame counter and a UFO-style smoothness test.

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Measured refresh rate
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Skipped frames

This measures the animation rate of this browser tab, not the panel's spec sheet: low-power mode, background throttling and some browsers (notably Safari) can cap it below what the display supports.

🛸 Full rate · — Hz
🛸 Half rate · — Hz
🛸 Quarter rate · — Hz
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Result

This page runs the refresh rate test tuned for 240 Hz esports displays: the live readout measures the actual frame rate of this browser tab and the verdict tile compares it against 240 Hz with ±5% tolerance.

At 240 Hz every link in the chain matters: the OS refresh setting must say 240, the cable must have the bandwidth at your resolution, and the GPU must keep up. A reading of exactly 120 or 144 usually means the monitor is running a lower mode — check the monitor's own OSD menu as well as the OS settings, since some panels need their high-refresh mode switched on in both places.

Fair warning at this speed: browsers are the weakest link. Even with the display genuinely at 240 Hz, compositor limits, power saving and page load can hold a browser tab short of 240 frames per second. A pass here is solid proof the full chain works; a near-miss fail is worth re-checking in a game's built-in frame counter before blaming the monitor.

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Executed in Browser

Your files and inputs never leave this device. Processing runs completely offline. 100% Secure.

Accepted Formats & Rules

  • Live Hz readout computed as the median of the last 60 requestAnimationFrame intervals.
  • UFO-style motion strips at full, half and quarter of the measured rate with an adjustable speed slider.
  • Frame-time graph with slow frames highlighted and a running skipped-frame counter.

Key Benefits

✓ Instant answer: measurement starts the moment the page loads and settles on a stable median reading within a second or two.
✓ Sees real problems: the frame-time graph and the skipped-frame counter expose stutter that a single averaged number would hide.
✓ Honest numbers: the tool reports what this browser tab actually receives — and tells you when the browser, not the display, is the limit.

Use Cases

  • • Verify a new 120, 144 or 240 Hz monitor is actually running at its advertised rate and not the 60 Hz the operating system defaulted to.
  • • Catch silent throttling: watch live as battery saver, low-power mode or a busy browser caps the animation frame rate of your tab.
  • • Show someone why high refresh matters with the moving strips — the same speed rendered at full, half and quarter of the measured rate.