SpeedXG
Touchscreen Test
Touch the pad with one or more fingers. Dead zones, dropped contacts and swapped axes show up immediately.
Touch with one or more fingers
How to read the test
Each finger should get its own marker. If a corner never registers, the digitizer may be failing. If two touches become one, the panel or OS is merging contacts.
FAQ
Does this work with a stylus?
If the browser reports pointer events, yes. Pressure is not always exposed to the web.
Can I test a Windows touch laptop?
Yes in Edge or Chrome. Use fingers, not only the trackpad.