Atomic Pink on Summer Crush
#fb7efd on #f2d6da
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
1.62:1
Fails AA
Not AAA (7:1). Swapping the two colours gives the same number — the ratio does not know which is the text.
APCA
Lc 22.8
Clears Lc 15 — disabled or purely decorative text, which is not meant to be read.
Dark text on a lighter ground.
Colour difference
ΔE00 27.2
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#a426a8 is the nearest colour of the same hue that passes AA on #f2d6da, 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 1.90:1, ΔE00 29.4.
deuteranopia
Ratio 1.51:1, ΔE00 27.2.
tritanopia
Ratio 1.32:1, ΔE00 6.6.
The weakest of the three is tritanopia, where the two are ΔE00 6.6 apart against 27.2 for a trichromat — still two colours, but a closer call than it looks to you.
Both colours have pages of their own: Atomic Pink ·Summer Crush · the same pair the other way round ·all pairs