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dyff vs Difftastic: catalog facts
dyff	Difftastic
Free Free and open source under the MIT licence.	Free The open-source application is available without a license fee.
Windows, macOS, Linux, Command line	Windows, macOS, Linux
Shows structural changes rather than raw text lines Points to each change by its path in the document	Syntax-aware comparisons across many languages
Command-line only, with no graphical interface Focused on YAML, with JSON support as a secondary use	It can use substantial memory and does not produce applicable patches.
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
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 2, 2026	Official website Full listing and sources Checked September 22, 2026

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