Colour Contrast Cards
Generate cards where each cards background is a palette colour. Within each card view which colours within your palette have sufficient contrast for text. Default colourset is University of Southampton brand, but you can upload your own.
Colour Input Options
Contrast Analysis Results
How to read these results
Colours are shown as they are, with no simulation applied.
The contrast ratios and APCA values on the cards are always computed from the original colours. They do not change under simulation.
Colour vision simulation is unavailable because your system is using forced colours. Your own colour choices have already replaced this palette, so simulating the palette would show you nothing about it.
APCA, the Accessible Perceptual Contrast Algorithm, is the candidate contrast method for WCAG 3. It models perceived readability more closely than the WCAG 2 ratio, particularly for light text on dark backgrounds. Filtering to pairs that pass both standards removes the Graphics and Large Text section, because a pair that does not reach 4.5 to 1 cannot satisfy WCAG AA. APCA is in beta and subject to change.
Unusable Background Colours
These colours cannot be used as backgrounds because they don't provide sufficient contrast with any text colour for WCAG AA compliance.