Cyantific on Heavy Cream
#77c9c2 on #e8ddc6
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
1.43:1
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 17.2
Clears Lc 15 — disabled or purely decorative text, which is not meant to be read.
Dark text on a lighter ground.
Colour difference
ΔE00 26.6
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#0e6e69 is the nearest colour of the same hue that passes AA on #e8ddc6, 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 1.31:1, ΔE00 11.8.
deuteranopia
Ratio 1.50:1, ΔE00 20.8.
tritanopia
Ratio 1.62:1, ΔE00 52.3.
The weakest of the three is protanopia, where the two are ΔE00 11.8 apart against 26.6 for a trichromat — still clearly two colours.
Both colours have pages of their own: Cyantific ·Heavy Cream · the same pair the other way round ·all pairs