Compare software

KDiff3Diffchecker
Free

Free and open source under the GPL v2 or later.

 Freemium

Basic online text comparison is free; some features have free trials and unlimited access…

Windows, macOS, Linux Windows, macOS, Web
  • Compares and merges files and whole directories
  • Three-way merge for resolving version control conflicts
  • Compares text, files and code
  • Offers a free side-by-side text comparison
  • Interface looks dated next to newer diff tools
  • Focused on text; no rich comparison of binary formats
  • Some comparison features are free to try and unlimited on Pro.
Downloadable app Downloadable app, Web application
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

Checked October 1, 2026

Checked October 8, 2026

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