Download of ResolutionTab 1.1 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 actual developer of this free software for Mac is Vadim Shpakovski.
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 most popular version of the application is 1.1. This free application is suitable for Mac OS X 10.8.1 or later.
From the developer:
ResolutionTab is a menu bar app for fast switching between Standard & HiDPI display modes.
Modern apps and websites should look great on Retina displays, so we have to test them in both standard and ultrahigh resolution modes. But when you configure your display in System Preferences, it takes plenty of time to switch from the standard to the HiDPI mode and vice versa.