This utility app provides a portable ruler for on-the-go measurements. It also includes a suite of additional tools like a protractor, spirit level, and various meters for diverse measurement needs.
1.21
October 6, 2025
Ruler correction for some iPad models
$2.99
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Rul3r is a utility app that provides a portable ruler on your phone for measuring lengths. It also offers a variety of other measurement and utility tools.
Key features include a portable ruler, protractor, plumb line, spirit level, elevation and air pressure meter, decibel meter, and an ordinal date converter.
The app is free to download and use, but it does contain advertisements and offers in-app purchases for additional functionality or to remove ads.
The description does not specify exact compatibility requirements, but as a mobile application, it is designed for smartphones and tablets.
You would use Rul3r when you need to quickly measure an object without a physical ruler, check if a surface is level, measure angles, or monitor environmental factors like air pressure or sound levels.
