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BackstopJS vs Percy: catalog facts
BackstopJS	Percy
Free Free and open source.	Freemium Hosted service from BrowserStack; plan details are listed on the Percy site.
Command line	Web
Compares new screenshots against approved reference images Command-line tool that fits into build pipelines	Catches visual UI changes across browsers and screen widths Built-in review step for approving visual differences
Requires configuring scenarios by hand Commits to the main repository are infrequent	Hosted service only, no self-hosted option Closed source
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 1, 2026

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