Atomic Pink on Flirt
#fb7efd on #7a2e4d
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
4.09:1
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 -45.9
Clears Lc 45 — large or heavy display text.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 43.3
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#fe8dff is the nearest colour of the same hue that passes AA on #7a2e4d, 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 4.01:1, ΔE00 40.7.
deuteranopia
Ratio 4.12:1, ΔE00 46.1.
tritanopia
Ratio 3.88:1, ΔE00 37.3.
The weakest of the three is tritanopia, where the two are ΔE00 37.3 apart against 43.3 for a trichromat — still clearly two colours.
Both colours have pages of their own: Atomic Pink ·Flirt · the same pair the other way round ·all pairs