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KDiff3 vs TortoiseMerge: catalog facts
KDiff3	TortoiseMerge
Free Free and open source under the GPL v2 or later.	Free Free and open source under the GPL as part of the TortoiseSVN project.
Windows, macOS, Linux	Windows
Compares and merges files and whole directories Three-way merge for resolving version control conflicts	Side-by-side view with coloured changes Tight integration with TortoiseSVN
Interface looks dated next to newer diff tools Focused on text; no rich comparison of binary formats	Windows only Designed around Subversion rather than Git
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License: GPL-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.