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KDiff3 vs Diffinity: catalog facts
KDiff3	Diffinity
Free Free and open source under the GPL v2 or later.	Free Freeware.
Windows, macOS, Linux	Windows
Compares and merges files and whole directories Three-way merge for resolving version control conflicts	Highlights changed lines, words, and characters Compares folders as well as text files
Interface looks dated next to newer diff tools Focused on text; no rich comparison of binary formats	Windows only Requires the .NET 8 runtime
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0-or-later	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 8, 2026

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