Core Features
Calibratable ruler
Match the scale to a known length and save calibration per device.
CM and inch scales
Switch between centimeters and inches for everyday measurement.
Magnifier assist
Use the magnifier to align edges and marks with more confidence.
Haptic feedback
Feel subtle feedback as you adjust measurement marks.
What can you measure?
Small objects
Match the scale to a known length and save calibration per device.
Stationery
Switch between centimeters and inches for everyday measurement.
Frames
Use the magnifier to align edges and marks with more confidence.
DIY projects
Feel subtle feedback as you adjust measurement marks.
About accuracy
Accuracy depends on calibration and placing the object directly on the screen. Calibrate once for more reliable short measurements.
Frequently asked questions
What is Screen Ruler?
Screen Ruler turns your iPhone or iPad screen into a calibratable digital ruler.
How accurate is it?
It is most reliable after calibration with a known-length object placed on the screen.
Can I use inches?
Yes. Screen Ruler supports both centimeters and inches.