Screen Ruler turns your iPhone or iPad screen into a calibratable digital ruler.

Even before calibration, Screen Ruler adapts the scale for known iPhone and iPad device profiles. If you still notice an offset, calibrate with an object of known length to better match your device.

Yes. Screen Ruler supports both centimeters and inches.

It helps align measurement marks with object edges more precisely.

Yes. Use the Remove Ads purchase or support the developer in the app.