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ARC Toolkit vs Stark: catalog facts
ARC Toolkit	Stark
Free Free to install from the Chrome Web Store.	Freemium Free sign-up available, with paid plans and demos for organisations.
Browser extension	Web, Browser extension
Runs inside the browser on the current page Uses TPGi's ARC rules engine	Covers design, browser and code stages in one suite Free sign-up for individuals
Checks one page at a time Automated checks do not replace manual testing	Aimed mainly at companies, with advanced features behind sales Requires an account
Browser extension	Web application, Hosted service, Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Not stated if it works offline
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.