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Pa11y vs Rocket Validator: catalog facts
Pa11y	Rocket Validator
Free Free and open source.	Paid Paid subscription service with a free trial.
Self-hosted, Command line	Web
Command-line tool for quick one-off accessibility checks CI tool for testing a list of pages in builds	Site-wide HTML and accessibility checks in one report Up to 5,000 pages per report
Automated checks catch only part of all accessibility problems The dashboard requires running your own server	Paid service after the trial Requires an account
Downloadable app, Self-hosted	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 September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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