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I’m working with a notation software and I would need to space certain graphical elements evenly within a predetermined space (e.g.: I set a 5cm space and I have 5 elements, they need to be precisely 1cm from each other), something that the software cannot do on its own (that is, without printing on paper, measuring, then moving the objects, then printing again and so on...).

The ideal solution would be to have a floating ruler on the screen or a superposed grid similar to millimetric paper that would still allow click-through (i.e.: interaction with the program below it).

Is there an app that provides this tool?

Thank you very much

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    I’m not sure if OmniGraffle can do this, but it was the first app that popped into my head as a possibility. – TJ Luoma Aug 21 '19 at 16:25
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iconfactory's xScope

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Powerful on-screen rulers for precise pixel measurements that include scaling, rotation, and edge snapping.

xScope’s rulers can be used to measure any on-screen element, including the distance and angles between objects. Holding down the Control key while dragging the ruler near an on-screen object causes the edges and ends of the ruler to “snap” into place, making measuring quick and easy. Additionally, the Ruler tool includes calipers which can be toggled on or off and used for outside measurements.

Not sure if non-pixel measurements are possible.

  • This can only display measurements in Screen pixels or Window points. – user3439894 Aug 21 '19 at 13:27
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Have a look at:

Ondesoft Screen Rulers for Mac

Easy, powerful and accurate virtual screen rulers for your Mac

Ondesoft Screen Rulers is a highly configurable measuring utility for Mac with many intuitive features, enable you to measure objects quickly and precisely on your Mac screen in Pixels, Inches, Picas, Centimeters and multiple customizable units according to your need. It can measure square areas, diagonals and display angles.

  • Online measuring tool to measure the dimensions of any objects on Mac.
  • Easy protractor enables you to measure angles in radians or degrees with Ondesoft Screen Rulers.
  • Detail Window provides you a magnifier and pixel value for accurate measurements.
  • Logger Window serving as your personal notebook can remember all the detailed measurements data history.
  • Customize keyboard shortcuts, ruler colors and transparency settings according to your preference.

Has a free trial, $9.95 USD to buy.

Note: I am not affiliated with the developer of this software. Simply a Google search.

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I've used Free Ruler for Mac OS X in the past. I'm amazed that still works just fine. However, it does not allow click-through.

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    This is a 32-bit app and will not run on macOS Catalina. – user3439894 Aug 21 '19 at 11:26
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I have found these two free utilities.
They kind of do what I need but are very basic so anything more would be overkill for them.
- Red Line Tools.
- Ruler on Call EZ

Both available on the Mac App Store.

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Free Ruler has been updated for macOS Catalina. It’s free and open-source: http://www.pascal.com/software/freeruler/

Then there’s PixelSnap for $40 (that’s $10 cheaper than xScope and comes with seemingly superior dimension measurement engine).

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