What to do
Trace slow lines across every row and column. Revisit any unfilled cell from several directions.
Touchscreen Dead Zone Test
Drag across a touch map to find missed cells, dead touch zones, and tracking gaps.
Drag across every grid cell
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Active Points0
Max Multi-Touch0
Last InputNone
PressureUnavailable
Grid Coverage0%
Run NotesUse real touchscreen hardware for the most meaningful result. Mouse input is only a fallback.
Local history
Save a result to keep it in this browser. History holds your five most recent saved results for this test.
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How to use this test
What to look for
An unfilled cell shows where this run received no contact. Repeat the same area before concluding there is a problem.
Contact positions, identifiers, and pressure come from Pointer Events where available. Pressure may be a default value on unsupported hardware. Browser gestures and palm rejection can interrupt contact tracking.