Hint of Blue on Opera
#cee1f2 on #816575
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
3.87:1
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 -60.1
Clears Lc 60 — headlines and other larger text.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 40.9
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#e1f1ff is the nearest colour of the same hue that passes AA on #816575, 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 4.14:1, ΔE00 35.9.
deuteranopia
Ratio 3.74:1, ΔE00 33.7.
tritanopia
Ratio 3.58:1, ΔE00 53.3.
The weakest of the three is deuteranopia, where the two are ΔE00 33.7 apart against 40.9 for a trichromat — still clearly two colours.
Both colours have pages of their own: Hint of Blue ·Opera · the same pair the other way round ·all pairs