Rulers is an app that lets you measure, align and inspect everything on your monitor(s).

Rulers allows you to create as many rulers as you want on the entire screen area like most common graphic editors allow on their working areas only.

The guide lines enable you to measure and position objects with precision. Rulers is incredibly useful in many fields, such as computer graphics, desktop publishing and web design.

Rulers can also be used to select a screen area and take a screenshot that is automatically saved to your desktop or copied to system clipboard.

See it in action here:


• Unlimited rulers creation
• Rulers autosave option
• Grid generator
• Multiple units of measurement support
• Multi monitor support
• Take a screenshot of selected area or whole screen
• Magnifier
• Color picker
• Available in 10 languages (English, Italian, Spanish, German, French, Japanese, Hungarian, Dutch, Russian, Czech)

What’s New

Version 2.11.8

More reliable color measurement on latest OS X versions.

Minor enhancements and bug fixes.

Ratings and Reviews

3.7 out of 5
26 Ratings

26 Ratings

scorcher14 ,

Not what I needed

It’s always tough to be required to purchase an application before you can try it. What I want to do is simple: find the pixel distance between 2 points. I’ve read the help, and I can’t do it without pulling out a calculator and doing the math. The guides and rulers are great, but to measure the distance I need to do that part on my own. I’m sure others will say I didn’t read the documentation or something, but I did and if the feature is there it simply is not obvious. Bascially, I want to select a region know it’s size, simple as that, and I was not able to do it after 30 minutes of trying, so I figure I just wasted 5 bucks.

Finally figured out that if you hover the mouse over a segment of a guideline, it will highlight red and show you the length of that segment. Added a star to review.

iplayitofflegit ,

I have used Rulers for 2 years and enjoyed the experience

Rulers has proven indispencible while styling web sites in browser as a Front End Developer. The app especially helps when I can sit with a designer and show them how acurate the styles are or explain why the element has to be fluid in a responsive site and then make tweaks to padding. I can clearly illustrate the change with an accurate measurement. The app is familiar to Photoshop guides, which is nice. I like the look of the app a lot, simple and intuitive.

I wish you could save preset guides. If the app had this feature it would get 5 stars from me. I often have to delete the guides and reposition for another task. I want to be able to make presets. The only bug I’ve noticed is after you connect to multiple monitors, if you’ve already hidden the rulers they come back, making you have to hide them again. A small gripe for such an awesome app.

MillionthMonkey ,

BUGGY on two-monitor setups

On a second monitor, with a resolution higher than the laptop’s monitor, horizontal guide lines often cannot be adjusted. Better hold your hand really still before releasing your mouse or trackpad, because if it lands on the wrong spot, you won’t be able to adjust its position. Other apps grab the focus. Your only option at that point is to delete the grid line and start over.

This happens when a horizontal guide line is positioned so that it appears on the second (usually larger) monitor that you’re trying to measure something on, but is too high or low to appear on the laptop’s own screen. The only workaround is to drag stuff down to vertical coordinates that are within the range of the laptop’s screen. I usually drag something I want to measure over onto the laptop's screen, measure it there, and then drag it back onto the second monitor.


omnidea srl
4.8 MB

OS X 10.6.6 or later


English, Czech, Dutch, French, German, Hungarian, Italian, Japanese, Russian, Simplified Chinese, Spanish, Traditional Chinese

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.