Differences 1.5 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. Differences for Mac relates to Developer Tools. The actual developer of this Mac application is Maurice Kelly. 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.
From the developer:
Differences is a menu bar application designed to show the difference between two chunks of text quickly. Working in both horizontal and vertical orientations, it offers two side-by-side text editors that offer live editing of the text you want to compare.
You may want to check out more Mac applications, such as Url Extractor X, Navicat for Oracle or JustinmindPrototyper, which might be similar to Differences.