Download of aspectRatio 2.7.3 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 versions of the program are 2.0 and 1.1.
The actual developer of this free Mac application is produceNewMedia. 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 software relates to Design & Photo Tools.
From the developer:
aspectRatio features a fixed calculator for common square and non-square pixel aspect ratios. It also features a Custom Calculator with presets and "Not-Divisible by 16" alerts. These indicators will appear when calculation outputs are not evenly divisible by 16. For more information please refer to the Help HUD located in the aspectRatio Custom Calculator module.
Custom calculations begin with the user defining a source aspect ratio.
You may want to check out more software for Mac, such as 3D Image Commander, ImageBuddy or Panoweaver, which might be similar to aspectRatio.