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TortoiseMerge vs DiffMerge: catalog facts
TortoiseMerge	DiffMerge
Free Free and open source under the GPL as part of the TortoiseSVN project.	Free Free to use under SourceGear's freeware license.
Windows	Windows, macOS, Linux
Side-by-side view with coloured changes Tight integration with TortoiseSVN	Two-way diff and three-way merge with editable panes Side-by-side folder comparison
Windows only Designed around Subversion rather than Git	Closed source freeware Infrequent updates
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License: Freeware
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 2, 2026

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