Measure is a free and open-source tool for finding the optimal width of a body of text. This is done by measuring the width of a line of text or the space between two lines. The result is displayed in a popup window, and it can be used on any page or site. It's a simple tool, so it's easy to use, and it's free!

WHY WOULD I USE IT?

A lot of attention has been spent on making the reading experience better on mobile devices, but the web still has many advantages when it comes to reading. One of the most important is that you can adjust the font size, and that's not possible in a mobile app.