Ruler

A simple, user-friendly and accurate ruler for your phone!

Use a coin or a credit card to calibrate the ruler anywhere, when you don't have a real ruler with you!

- Ad free, for real, forever!

- Pick your units: fractional inches, decimal inches, centimeters or millimeters

- Calibrate your ruler with a credit card to get you started anytime, anywhere

- Don't have a credit card with you? Calibrate your ruler with a coin!

- Calibrate your ruler with a real ruler to achieve the best precision in your measurement transfers

- Manually set the ruler to a known length for accurate measurements

- Night mode to save battery (on AMOLED screens) and to relieve your eyes at night

- Save your measurements for future use

- No permission required

Update history:

3.5 -- Millimeters, set to predefined length

3.3 -- Calibrate with a credit card, remove saved measurements from history

3.2 -- Fractional display of measurements in inches

3.0 -- Android Material theme and new scale for measurements in inches

2.1 -- Calibrate with a coin, default calibration button (reset)

2.0 -- You can now save your measurements

1.7 -- Night mode to save battery and/or read more easily at night

1.6 -- Added default calibration for common devices (Nexus series, Galaxy S series, Galaxy Note 1, 2 and 3)