Compare software

Diffchecker vs KDiff3: catalog facts
Diffchecker	KDiff3
Best for: People checking changes between text, files or code	Best for: Developers who need a free visual diff and merge tool for Git conflicts
Free + paid options Basic online text comparison is free; some features have free trials and unlimited access is on Pro.	Free Free and open source under the GPL v2 or later.
Windows, macOS, Web	Windows, macOS, Linux
Compares text, files and code Offers a free side-by-side text comparison All 3 strengths for Diffchecker Compares text, files and code Offers a free side-by-side text comparison Desktop app supports offline diffs	Compares and merges files and whole directories Three-way merge for resolving version control conflicts All 3 strengths for KDiff3 Compares and merges files and whole directories Three-way merge for resolving version control conflicts Free and open source from the KDE community
Some comparison features are free to try and unlimited on Pro.	Interface looks dated next to newer diff tools Focused on text; no rich comparison of binary formats
Downloadable app, Web application	Downloadable app
Not open source	Open source
License not stated	License: GPL-2.0-or-later
Not stated if an account is needed	No account needed
Offline features available	Offline features available
Official website Full listing and sources Sources for Diffchecker diffchecker.com Catalog checked October 8, 2026	Official website Full listing and sources Sources for KDiff3 invent.kde.org/sdk/kdiff3 Catalog checked October 1, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.