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 visual diff and merge tool for comparing files, folders, and version-controlled projects. It shows changes as files are edited, provides navigation between differences, and assists with three-way merges, including conflict handling and display of the base version. Folder comparisons identify missing or modified files and allow selected files or folders to be ignored. Meld supports Git, Mercurial, Bazaar, and Subversion, including integration with tools such as git mergetool. Users can define regular-expression filters to ignore matching text, but filtering support is incomplete and filters cannot change the number of lines. The software is available for Linux and Windows. Linux packages are offered by most Linux and Unix distributions and through Flathub; Windows users can download an installer. Windows builds do not support automatic updates or portable installs. macOS is not yet supported, though the project lists semi-official builds and installation options through Homebrew, MacPorts, or Fink. Meld 3.24.0 is listed as the stable release dated 20 June 2026. The plan costs nothing and lists a GPLv2-or-later license, except as noted.