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BackstopJS vs Diffy: catalog facts
BackstopJS	Diffy
Free Free and open source.	Paid Commercial service; plan prices are not given in the research.
Command line	Web
Compares new screenshots against approved reference images Command-line tool that fits into build pipelines	Compares screenshots across local, staging and production AI summaries sort changes by type and impact
Requires configuring scenarios by hand Commits to the main repository are infrequent	Hosted service; screenshots are taken on its infrastructure Pricing not stated on the homepage
Downloadable app	Hosted service
Open source	Closed source
License not stated	License not stated
No account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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