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ARC Toolkit vs Button Contrast Checker: catalog facts
ARC Toolkit	Button Contrast Checker
Free Free to install from the Chrome Web Store.	Free Free to use.
Browser extension	Web
Runs inside the browser on the current page Uses TPGi's ARC rules engine	Tests all buttons and links on a page at once Checks default, hover and focus states
Checks one page at a time Automated checks do not replace manual testing	Only checks buttons and links, not all text on the page Needs a publicly reachable webpage to scan
Browser extension	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is 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 October 2, 2026

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