Super Pink on Double Denim
#ce6ba6 on #95bce1
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
1.68:1
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 20.0
Clears Lc 15 — disabled or purely decorative text, which is not meant to be read.
Dark text on a lighter ground.
Colour difference
ΔE00 38.7
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#812460 is the nearest colour of the same hue that passes AA on #95bce1, 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 2.09:1, ΔE00 18.9.
deuteranopia
Ratio 1.51:1, ΔE00 13.4.
tritanopia
Ratio 1.24:1, ΔE00 58.7.
The weakest of the three is deuteranopia, where the two are ΔE00 13.4 apart against 38.7 for a trichromat — still clearly two colours.
Both colours have pages of their own: Super Pink ·Double Denim · the same pair the other way round ·all pairs