DeltaWalker vs KDiff3

DeltaWalker is desktop software for comparing, synchronizing, merging, automating, and analyzing files and folders on Linux, macOS, and Windows. Text comparison displays changes inline and supports editing, regular-expression find and replace, and syntax highlighting for close to 50 programming languages. Image comparison examines attributes and pixels; version 3 adds zoom, alignment, and inspection tools. Folder comparison identifies differences between hierarchies and can synchronize by copying, moving, or deleting files. File comparisons support read/write access over (S)FTP(S) and WebDAV, and read-only access over HTTP(S); folder comparisons support read/write access over (S)FTP(S) and WebDAV. Pro and Oro include three-way comparison and automatic merging of non-conflicting text changes. The maker documents integrations with Git, Mercurial, Bazaar, SVN, SourceTree, and Visual Studio, plus scripting and command-line automation. Standard costs $39.99, paid once for one platform, Pro costs $59.99, paid once for one platform, and Oro costs $89.99, paid once for all platforms. A 30-day trial is listed; there is no free plan.

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.