Spotty — dead pixel test

Frank Hermann

About this app

Spotty turns your phone and a connected display into fullscreen test surfaces for finding faulty pixels and checking image quality.

Connect a compatible monitor over USB-C and keep using your phone as the controller while both screens stay synchronized. You can also test the phone by itself.

What you can test

- Black and white fills for bright pixels, dark pixels, and uneven brightness
- Red, green, and blue fills for stuck pixels and individual color channels
- A grayscale gradient for banding and tonal transitions
- RGB color bars for comparing color reproduction
- A pixel grid for inspecting sharpness and pixel structure

Swipe between tests, tap to hide the controls, and inspect the whole display without distractions.

Spotty works locally. It does not require an account or network connection, and it contains no ads.