ArchiScale 1.6 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
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. The following version: 1.5 is the most frequently downloaded one by the program users. This app's bundle is identified as com.paulfrancois.ArchiScale. You can install this free program on Mac OS X 10.7 or later. This free Mac app was originally designed by Paul François.
From the developer:
ArchiScale is a Mac OS X software that converts distances using a user-defined scale. It is also able to determine which scale is the best to draw something on a given paper format. ArchiScale is a free and open source, small software that converts distances using a user-defined scale.