How to use this tool
- 1Slowly drag your finger across the whole grid, covering every square.
- 2Squares turn green as they are touched; the counter shows coverage percentage.
- 3Use several fingers at once to see how many simultaneous touches your screen supports.
- 4Squares that never turn green even when touched indicate digitizer dead zones.
- 5Tap the refresh button to restart the test.
About this test
A touchscreen is a mesh of sensors. When part of that mesh fails you get 'dead zones', regions where touches are not registered, which ruins typing and gaming.
This mapping covers the entire screen and counts how many fingers are recognized at once (multi-touch). Most modern Android phones support 5 to 10 simultaneous touch points.
Privacy: this tool runs entirely in your browser. No image, audio or device data is recorded or sent to any server.
Frequently asked questions
What causes touch dead zones?
Drops, pressure, moisture, poor-quality screen protectors or a failing digitizer. Sometimes restarting the phone or removing the protector fixes temporary issues.
How many simultaneous touches are normal?
It depends on the model, but 5 to 10 points is typical. If you use 3 fingers and the counter stays at 1 or 2, multi-touch may be defective.