AptDiff has been discontinued. Similar apps include WinMerge, which is free and open source. Other options are Meld, Beyond Compare, KDiff3 and P4Merge. There's no shortage of Diff Tools like AptDiff, with more than 50 alternatives for Windows, Mac, Linux, the web and self-hosting.
Text Compare lets you instantly see the difference between two pieces of text. Compare text by paragraph, word or character. Paste in two pieces of text, and Text Compare will highlight what has been inserted in, or deleted from, the original text.
Online Text compare is a browser based data compare tool that highlights the differences between two versions.
