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KDiff3 vs DeltaWalker: catalog facts
KDiff3	DeltaWalker
Free Free and open source under the GPL v2 or later.	Paid Commercial software with licences and upgrades sold through its store; a trial is offered.
Windows, macOS, Linux	macOS
Compares and merges files and whole directories Three-way merge for resolving version control conflicts	Three-way comparison and synchronization for files and folders Compares Office, PDF, archives, XML and images
Interface looks dated next to newer diff tools Focused on text; no rich comparison of binary formats	Paid licence required Version 3 is still a release candidate
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	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.