How to use the Refresh Rate Test
- Open the page and wait a few seconds while it measures.
- Read the refresh rate; the chart shows the time of every frame.
- Watch the moving block — smooth motion means frames aren’t being dropped.
How it’s measured
Browsers draw in step with the display, so the tool counts frames with requestAnimationFrame and rounds the result to the nearest standard rate (60, 75, 90, 100, 120, 144, 165, 180, 240, 360 Hz).
Showing 60 Hz on a 144 Hz monitor?
- Set the refresh rate in Windows (Settings → System → Display → Advanced display) or macOS (System Settings → Displays).
- Use a cable that supports it — DisplayPort or HDMI 2.0+; some HDMI cables cap at 60 Hz.
- Laptops on battery may lower the rate to save power, and some browsers limit frame rate in power-saving mode.
Also searched as: monitor hz test, what is my refresh rate, fps test, 144hz test, screen refresh rate, hz checker.
Tools that pair well with the Refresh Rate Test
- Dead Pixel Test — Fill your screen with solid colors, gradients and test patterns to spot dead or stuck pixels, backlight bleed and banding — on a new monitor, laptop, TV or phone.
- Keyboard Tester — Press every key and watch it light up on the on-screen keyboard — find dead, stuck or repeating keys, see the key and code for each press, and check how many keys register at once.
- Click Speed Test (CPS) — How fast can you click?
- What Is My Screen Resolution — Your screen and browser window sizes in CSS pixels, the device pixel ratio and the real physical resolution — measured live by your browser.
Frequently asked questions
Is the result exact?
It’s accurate to the nearest standard refresh rate. Background tabs, battery saver and busy CPUs can lower the measured frame rate.
Why does the frame-time chart spike?
Spikes are dropped or late frames, often from background work. Occasional spikes are normal; regular ones show as stutter.
Is anything uploaded or recorded?
No. Everything runs in your browser; results and settings are kept on this device only.
Can I install Refresh Rate Test as a web app and use it offline?
Yes. Refresh Rate Test is an installable web app (PWA) — installed from your browser, not downloaded from an app store. Click Install app at the top of this page in Chrome or Edge (Windows, macOS, Linux, ChromeOS) or on Android, use Share → Add to Home Screen on iPhone and iPad, or File → Add to Dock in Safari 17+ on a Mac. It then opens in its own window with its own icon, and because it runs entirely in your browser it keeps working offline. Firefox on desktop can’t install web apps. How installing works.