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