Ballet on Purple Climax
#f7d5d4 on #8800ff
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
4.42:1
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 -60.7
Clears Lc 60 — headlines and other larger text.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 51.6
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#f9d7d6 is the nearest colour of the same hue that passes AA on #8800ff, 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 5.02:1, ΔE00 57.4.
deuteranopia
Ratio 4.17:1, ΔE00 54.9.
tritanopia
Ratio 4.35:1, ΔE00 64.1.
The weakest of the three is deuteranopia, where the two are ΔE00 54.9 apart against 51.6 for a trichromat — still clearly two colours.
Both colours have pages of their own: Ballet ·Purple Climax · the same pair the other way round ·all pairs