1
Choose the input mode
Use touch input only or
mouse check only.
Touch test surface
TOUCH ONLY · browser-received events
Ready · no session recorded
12 columns × 6 rows · only received positions count
How it works
2
Sweep the test surface
Tap or drag to register
touch events in each cell.
3
Stop and review
Stop the session and
review the results.
Example from the synthetic session
54 unique cells ÷ 72 × 100 = 75%.Repeated samples do not add new coverage.
Questions, Answered
Does 100% prove the touchscreen works?
No. It only means every grid cell received a qualifying browser position during this session. It does not certify hardware or test the entire physical screen.
Can I use a mouse or stylus?
Mouse check is a separate mode. Touch mode excludes mouse and pen events. Keyboard inspection adds no coverage.
Why does rotating the device clear my session?
Rotation and surface resizing change the cell geometry. Start a fresh session so the observation remains consistent.
How is my data used?
Session positions stay in this browser unless you choose to export or share them. The shared record contains normalized positions, relative times, input mode, and an optional title; no device identifiers are included.
FREE 12-PAGE PDF GUIDEMake your next
Make your next
check repeatable.
- Run a careful screen check
- Record browser observations
- Know what tests cannot prove