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Kordu Tools

Monitor Refresh Rate Test

Detect your monitor's refresh rate by counting real frames rendered in the browser. See your Hz, frame times, and a live motion smoothness test.

Detected refresh rate
--Hz
Common refresh rates
60 Hz75 Hz120 Hz144 Hz165 Hz240 Hz

How to use

  1. 1

    Open the test

    Navigate to this page in the browser you want to test. For the most accurate results, close other tabs and heavy applications.

  2. 2

    Start the measurement

    Click the Start button. The tool begins counting frames using requestAnimationFrame and records the time between each frame.

  3. 3

    Wait a few seconds

    Let the test run for at least two to three seconds so it can stabilize. The detected Hz and frame time graph update in real time.

  4. 4

    Read your results

    Check the large Hz readout for your detected refresh rate. Review the frame time graph for consistency, and use the motion test strip to visually confirm smoothness.

Frequently asked questions

How does this refresh rate test work?
It uses the browser's requestAnimationFrame API to measure the time between consecutive frames. By averaging these intervals over a short window, it calculates how many frames per second your monitor is actually displaying.
Why does it show a different number than my monitor's rated Hz?
Browser compositing, V-Sync settings, GPU throttling, background processes, or power-saving modes can all cause the measured rate to differ slightly from your panel's native spec. For the most accurate result, run the test in fullscreen with hardware acceleration enabled.
Does this test work on mobile devices?
Yes. Most modern phones and tablets report accurate frame timing through requestAnimationFrame. Many flagship devices run at 90 Hz, 120 Hz, or even 144 Hz — this test will detect whatever rate the browser is actually rendering at.
Is my data sent to a server?
No. The entire measurement runs in your browser using JavaScript. No frame data, timestamps, or results are transmitted anywhere.
What is a good refresh rate for gaming?
60 Hz is the baseline. 144 Hz is the sweet spot for competitive gaming — it delivers noticeably smoother motion. 240 Hz and above offer diminishing but real improvements, especially in fast-paced shooters.

Find out your monitor's actual refresh rate with this free browser-based

test. The tool uses requestAnimationFrame to count how many frames your

browser actually delivers, then reports the detected Hz along with

per-frame timing data. A real-time frame time graph shows consistency,

and a motion smoothness strip lets you visually compare how fluid your

display is. Common refresh rates (60 Hz, 75 Hz, 120 Hz, 144 Hz, 165 Hz,

240 Hz) are displayed as reference badges so you can instantly identify

your panel. Everything runs client-side — no downloads, no installs,

no data sent anywhere.

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