Download of ScreenRuler 3.2 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The most popular version among the program users is 1.2.
The bundle identifier for ScreenRuler for Mac is com.claro.ScreenRuler. ScreenRuler works fine with Mac OS X 10.4.0 or later. The actual developer of this Mac application is com.claro.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The application lies within Education Tools, more precisely Teaching Tools.
From the developer:
ScreenRuler is a visual software tool to assist with reading on the Mac. The ScreenRuler software provides a strip or ruler across the screen, which can have the contrast changed and have the background greyed, colored or dimmed out.
ScreenRuler allows part of the screen to be highlighted or underlined depending on the users preference. It also has support for dual monitor and full screen overlay functions.
You may want to check out more Mac applications, such as Screen Ruler, which might be related to ScreenRuler.