Download of ColorScope 1.0.2 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. This Mac application was originally produced by Garage Duo Ltd. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
ColorScope creates a live approximation of common types of color blindness. Simply position the ColorScope window over your test content (whether it's a website, design, game, app or anything else) and ColorScope will provide a real-time simulation of the selected region.