Purple Climax on Crepuscular
#8800ff on #e7dcce
Body text at this size
And the smaller size most interfaces actually use for paragraphs — the size that decides whether a pair is usable.
Caption text, which almost nothing passes.
WCAG 2.1
4.45:1
Large text only
Not AAA (7:1). Swapping the two colours gives the same number — the ratio does not know which is the text.
APCA
Lc 57.7
Clears Lc 45 — large or heavy display text.
Dark text on a lighter ground.
Colour difference
ΔE00 56.3
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#8700fd is the nearest colour of the same hue that passes AA on #e7dcce, at 4.50:1. Only the lightness moved, and some chroma was given up to stay inside sRGB — which is the point: your colour stays recognisably your colour.
And to someone missing a cone
protanopia
Ratio 5.19:1, ΔE00 62.4.
deuteranopia
Ratio 4.14:1, ΔE00 57.0.
tritanopia
Ratio 4.29:1, ΔE00 54.2.
The weakest of the three is tritanopia, where the two are ΔE00 54.2 apart against 56.3 for a trichromat — still clearly two colours.
Both colours have pages of their own: Purple Climax ·Crepuscular · the same pair the other way round ·all pairs