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

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