Accessible Brand Colors (by Use All Five) checks up to ten of a brand's colors against each other at once, generating a chart of contrast ratios and WCAG compliance for every combination.
Testing colors against each other rather than one pair at a time surfaces problems a brand might not catch otherwise, like a secondary and accent color that look fine alone but fail together in a real layout.
Brand and marketing teams auditing an existing color palette for accessibility, not merely a single foreground and background pair.
Run the whole approved brand palette through it at once rather than testing colors individually. That's the actual point of the tool, and it's where problems between secondary colors tend to hide.
Check and adjust your brand colours for ADA compliance.
