Ruler

Xalpha Lab

About this app

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 permissions required

Ratings and reviews

Great and reliable ruler app. Well put together, no distracting content. Keep in mind though, before using the ruler you need to calibrate to get accurate results. This isn't the developer's fault, but some phones don't report accurate DPI settings, so in order to get accurate distances, calibration is needed. It's easy to calibrate in the app though so it's not really a problem. Props to the developer!

It does what it says on the tin. And not a single ad in sight - just a ruler. If I had money to spare, I'd get the donation version. Wanna buy you a beer, dude, because this is a great app. Way too many tool/utility apps are smothered in ads. And while I get that developers need money, it makes tools hard to use. This ones considerate of that - NO advertising at all!

As a maintenance worker in a factory, i need to sometimes make measurements. Its not enough for me to carry a dedicated tape measure, but in a pinch, this app works just fine. It's easy ro use, read, and adjust. I only wish that 0 started slightly higher on the screen so I could get a slightly more accurate measure. None the less, this does its purpose and does it well

What’s new

Improve calibration accuracy by moving the calibration handles 3x slower than the actual movement, allowing more precise control of the position.
Fix buggy 1/2 inch subdivision toggle.
Fix issues for devices with a notch or cutout a the top of the screen.
Add fullscreen toggle to use the space under display cutouts (e.g. camera, notch).