Screen Test
Find dead or stuck pixels, backlight bleed and touch dead zones — and see your real refresh rate.
Loading the tool…
Runs on your device. Nothing is uploaded.What Screen Test does
Check a screen in two minutes. Handy before you buy a used phone or laptop, or when something on the screen looks off.
Ten full-screen colours, with what to look for on each Touch grid that shows any area that doesn't respond Measured refresh rate, not just the spec
How it works
- 1Wipe your screen and turn the brightness up.
- 2Tap "Start colour test" and look closely at each colour. Tap or press → for the next one.
- 3On a phone or tablet, run the touch test and drag your finger over every square.
- 4Check the refresh rate and the screen details at the bottom.
Common questions
What is the difference between a dead and a stuck pixel?
A dead pixel stays black, so it shows up best on white. A stuck pixel stays one colour — red, green or blue — so it shows up best on black. A stuck pixel sometimes clears by itself after a few days; a dead pixel usually doesn't.
Why does it show 60 Hz on my 120 Hz phone?
Battery saver, low-power mode or the browser can limit the rate. Turn battery saver off, plug in, and press Measure again. On a computer, also check the refresh rate in your display settings.
A square in the touch test never fills. Is my screen broken?
Try that spot a few times with a clean, dry finger and remove any thick screen protector. If it still never fills, that part of the touch screen may not be responding.
Is this useful when buying a used phone or laptop?
Yes — open this page on the device and run the colour and touch tests. It takes about two minutes and catches the most common screen faults.