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Percy vs BackstopJS: catalog facts
Percy	BackstopJS
Freemium Hosted service from BrowserStack; plan details are listed on the Percy site.	Free Free and open source.
Web	Command line
Catches visual UI changes across browsers and screen widths Built-in review step for approving visual differences	Compares new screenshots against approved reference images Command-line tool that fits into build pipelines
Hosted service only, no self-hosted option Closed source	Requires configuring scenarios by hand Commits to the main repository are infrequent
Hosted service	Downloadable app
Closed source	Open source
License not stated	License not stated
Account needed	No account needed
Needs internet	Not stated if it works offline
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.