Touch Screen Test

Fullscreen fingertip grid: swipe to check, tap to flag dead zones.

On a phone or tablet? Tap to scan

Point your phone camera at the QR code to open this test on mobile.

▶ Start the touch test

Enter fullscreen and swipe every cell. Green means that cell responds to your finger; if a cell feels dead, skip-drift or unresponsive, tap it to mark it red.

💡 How it works

A browser can detect where your finger lands, so every cell you swipe turns green — but it cannot tell by itself whether a cell is faulty. Dead / drifting / unresponsive zones are therefore judged by you: tap that cell to mark it red.

Why choose this touchscreen test?

Adaptive grid

The grid recalculates to keep every cell about a fingertip in size on any screen — phone, tablet, any orientation.

Swipe to check, tap to flag

Dragging a finger across a cell turns it green (the touch engine registered it); tap a dead, drifting or unresponsive cell to mark it red.

End anytime with a long-press

No extra buttons on screen — just the grid. Long-press any cell to finish the test and return to the touch test page.

How to test

  1. 01 · Start the test

    Tap Start to enter fullscreen (a full-viewport overlay on devices that block fullscreen).

  2. 02 · Swipe every cell

    Drag your finger across the whole grid so every cell turns green.

  3. 03 · Mark faults & finish

    Tap any cell that feels dead / drifting / unresponsive to flag it red; long-press any cell to end the test and return to the touch test page.

Frequently asked questions

Can the page really detect a broken touch zone?

No strictly automatic detection exists — a browser only reports where your finger landed. This is why failing zones are marked by you. That manual judgement is the practical, honest way to map a faulty digitizer.

Why do cells turn green when I swipe?

Pointer events register every cell under your finger while dragging. A cell that never turns green while you swipe across it is exactly where to look for a dead zone.

What causes dead / floating touch zones?

Broken/aged digitizer film, cracked glass, water damage, battery swelling or a loose touch connector. A red cluster usually means hardware attention.

How many cells should I expect?

It adapts to your screen — roughly one cell per fingertip, so phones get ~8 columns and tablets get more, never too tight to test.