iPhone & iPad Touch Screen Tester
Test touch screen responsiveness on smartphones and tablets. Detect dead zones, ghost touches, and digitizer fractures before buying used devices.
📱 Smartphone Touch Screen & Digitizer Grid
Drag finger across screen to test all touch zones. Gray boxes indicate untested or broken digitizer areas.
How to Inspect Used Smartphones for Touch Screen Defects
What are Digitizer Dead Zones?
Smartphones use a glass digitizer laced with microscopic capacitive electrode traces. When a phone is dropped or suffered minor liquid ingress, rows of traces can sever. The display may show a crystal-clear image, but tapping or typing in that specific zone fails completely.
Before purchasing a refurbished or pre-owned iPhone or Android device, open this test in the phone's browser and swipe across all 100 blocks. If any sector fails to illuminate green, negotiate a discount or walk away from the purchase.