KDiff3 vs Meld

KDiff3 is a free, open-source desktop app for comparing and merging files and folders on Linux, macOS, and Windows. It can compare two or three text files or folders, showing differences line by line and character by character. For merge work, it can combine changes automatically and includes an editor for resolving conflicts, including three-way merges. Folder comparison and Git integration are supported. KDiff3 handles Unicode, UTF-8, and other file encodings; users can highlight or hide whitespace and comment changes, and print differences. It also supports version-control keyword and history merging, with network transparency through KIO. Its listed license is GPL-2.0-or-later. The Free plan costs nothing, and there is no free trial. Linux installation options include Discover or another AppStream store, a distribution package manager, or Flathub. The app page links to a handbook, forum, and bug-reporting page. KDE describes itself as an international community building and distributing free, open-source software since 1996.

Meld is a free, open-source desktop tool for comparing files, directories and version-controlled projects. It provides two-way and three-way comparisons, with live updates while files are edited and merged. Three-way merge assistance handles conflicts and shows the base version. Folder comparisons identify missing or modified files, let users open deeper file comparisons, and can ignore selected files or folders. Meld supports Git, Mercurial, Bazaar and Subversion, including use with tools such as git mergetool. It is packaged for most Linux and Unix distributions and is available through Flathub. Windows users download an installer; automatic updates and portable installations are not supported. Meld is not yet supported on macOS, although the site points to semi-official builds and package-manager options. The project is licensed under GPLv2 or later, except as noted. The listed Meld plan costs nothing, and the stable release shown is 3.24.0.