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KDiff3 vs VisualDiffer: catalog facts
KDiff3	VisualDiffer
Free Free and open source under the GPL v2 or later.	Free Free and open source.
Windows, macOS, Linux	macOS
Compares and merges files and whole directories Three-way merge for resolving version control conflicts	Side-by-side folder and file comparison Include and exclude filter rules
Interface looks dated next to newer diff tools Focused on text; no rich comparison of binary formats	macOS 13 or later only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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