Wild Thing on Atomic Pink
#654243 on #fb7efd
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
3.94:1
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 44.7
Clears Lc 30 — the floor: below this the draft considers text not readable at any size.
Dark text on a lighter ground.
Colour difference
ΔE00 46.1
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#5c3a3b is the nearest colour of the same hue that passes AA on #fb7efd, at 4.50:1. Only the lightness moved — which is the point: your colour stays recognisably your colour.
And to someone missing a cone
protanopia
Ratio 3.50:1, ΔE00 44.3.
deuteranopia
Ratio 4.15:1, ΔE00 49.9.
tritanopia
Ratio 4.36:1, ΔE00 41.2.
The weakest of the three is tritanopia, where the two are ΔE00 41.2 apart against 46.1 for a trichromat — still clearly two colours.
Both colours have pages of their own: Wild Thing ·Atomic Pink · the same pair the other way round ·all pairs