Compare software

DiffMerge vs KDiff3: catalog facts
DiffMerge	KDiff3
Free Free to use under SourceGear's freeware license.	Free Free and open source under the GPL v2 or later.
Windows, macOS, Linux	Windows, macOS, Linux
Two-way diff and three-way merge with editable panes Side-by-side folder comparison	Compares and merges files and whole directories Three-way merge for resolving version control conflicts
Closed source freeware Infrequent updates	Interface looks dated next to newer diff tools Focused on text; no rich comparison of binary formats
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.