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DiffMerge vs Diffuse: catalog facts
DiffMerge	Diffuse
Free Free to use under SourceGear's freeware license.	Free Free and open source under the GPL 2.0.
Windows, macOS, Linux	Linux
Two-way diff and three-way merge with editable panes Side-by-side folder comparison	Compares an arbitrary number of files at once Manual correction of line matching
Closed source freeware Infrequent updates	No directory comparison mentioned Interface is plainer than newer diff tools
Downloadable app	Downloadable app
Closed source	Open source
License: Freeware	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.