Super Pink on Master Sword Blue
#ce6ba6 on #00ffee
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
2.63:1
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 45.4
Clears Lc 45 — large or heavy display text.
Dark text on a lighter ground.
Colour difference
ΔE00 65.7
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#a3447e is the nearest colour of the same hue that passes AA on #00ffee, 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 3.55:1, ΔE00 36.6.
deuteranopia
Ratio 2.26:1, ΔE00 19.9.
tritanopia
Ratio 1.48:1, ΔE00 54.9.
The weakest of the three is deuteranopia, where the two are ΔE00 19.9 apart against 65.7 for a trichromat — still clearly two colours.
Both colours have pages of their own: Super Pink ·Master Sword Blue · the same pair the other way round ·all pairs