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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.

Main features:

What's New

Version 2.11.8:
  • More reliable color measurement on latest OS X versions.
  • Minor enhancements and bug fixes.


OS X 10.6.6 or later

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Rulers User Discussion

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Rc62 Member IconComment+28

Now that this is App Store only, how does one update their existing version 2? Going into the program setup and clicking update does not find the new version and the update is not available on the developers web page (not that I can find).

I'm not an App Store hater but this is one thing that annoys me about it... i. e. when I have an existing license and can not get updates (or have to jump through hoops to do so). It would be nice if the App Store recognized existing licensed software on my Mac and would allow updates (or upgrades). Guess I am asking too much...

Reply0 replies
Version 2.11.7
Drdul Member IconComment+448

Couldn't even try this out, as it crashed after about 15 seconds (when i tried to drag a guide). This is on a Mac Pro with 10.6.2

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Version 2.9
MacSmiley Member IconComment+8

FreeRuler is, uh, free.

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Version 2.3
Pat320 Member IconReview+70

Nice application, crash a few times (An exception of class NilObjectExeption was not handled)
on my macbook CD1/tiger but very easy to use, that's the most important!

My wishes for the future:
Be able to magnet a window in the ruler's corner and
Be able to save rulers setting and switch between these settings.


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Version 2.3
natuzzone Member IconReview+2

I've recently discovered Rulers and I think it's a great tool. It's the easiest way to measure everything is on the screen and take screenshots.

The interface is simple and cool. Rulers can be created and moved both thru drag and drop and shortcut (making adjustments more accurate).

I'm using it on a dual monitor configuration, with different size monitors, and it works perfectly.

There is also a Windows version available.

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Version 2.2
Bill Clinton Member IconReview+44
Bill Clinton

Still doesn't work correctly with dual vertical monitors. Horizontal lines now display on the upper monitor but not the lower one. Vertical lines are the same: the line ends at the border between the two monitors, displaying on the top one but not the bottom one.

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Version 2.2
Bill Clinton Member IconComment+44
Bill Clinton

This thing kind of goes belly up on my set-up--two monitors, one above the other. Vertical lines appear only on the upper monitor and horizontal lines don't appear at all.

Reply1 reply
Version 2.1

I use dual monitor setup and Rulers works perfectly.
There's a pair of rulers on each display.
If you want to create a line on a display, you need to drag it out from the ruler on that display.
This is why you can't move horizontal lines from display 0 to display 1 or you see vertical lines only on display 0.

Picon Member IconComment+66

I was using the previous version: 1.1.194 without problem. Then I updated to this version: 2.0.290.

On startup, this message appears: "Beta version expired: contact omnidea to receive a newer version (and it's no good to tamper your system date)."

Developer, please correct with the proper file to be downloaded. Otherwise, this is an excellent application.

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Version 2.0.290
ghokie Member IconComment+6

This looks like exactly what I've been needing... however, when downloaded from the developer's site and launched, there is a reference that the Beta version has expired.

Would love to try a working copy.

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Version 2.0.290
Bill Clinton Member IconComment+44
Bill Clinton

This program does not work correctly with vertically-oriented monitors of unequal size. (I can't test with monitors of equal size.) This is a common configuration for laptop users. Many programs have problems with this configuration, including Apple's window manager, so Rulers is not unique in this regard.

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Version 1.0.168
user icon+24
Version 2.11.8
user icon+0
> 4 6


Current Version (2.x)


Downloads 18,175
Version Downloads 1,743
License Commercial
Date 20 May 2013
Platform OS X / Intel 32
Price $4.99