📐 Wall 90° Checker

±0.2° around 90°

0.0°

Hold the phone flat against the wall to check plumb (90°). Or place it on a leveled surface and align the wall to 90°.

Tap Start Leveling to begin.

Enable Motion Access

Needed to read gravity (DeviceMotion). iOS requires a tap.

If it still doesn’t work: Settings → Safari/Chrome → Motion & Orientation Access → Allow