Sablé on Cyantific
#f6d8be on #77c9c2
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
1.42:1
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 -19.2
Clears Lc 15 — disabled or purely decorative text, which is not meant to be read.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 32.8
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#5f4730 is the nearest colour of the same hue that passes AA on #77c9c2, 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 1.27:1, ΔE00 12.8.
deuteranopia
Ratio 1.51:1, ΔE00 23.5.
tritanopia
Ratio 1.65:1, ΔE00 63.9.
The weakest of the three is protanopia, where the two are ΔE00 12.8 apart against 32.8 for a trichromat — still clearly two colours.
Both colours have pages of their own: Sablé ·Cyantific · the same pair the other way round ·all pairs