Sablé on Acoustic Brown
#f6d8be on #766b69
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
3.80:1
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 -59.1
Clears Lc 45 — large or heavy display text.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 35.2
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#ffecdd is the nearest colour of the same hue that passes AA on #766b69, 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 3.74:1, ΔE00 34.8.
deuteranopia
Ratio 3.83:1, ΔE00 35.4.
tritanopia
Ratio 3.88:1, ΔE00 37.3.
The weakest of the three is protanopia, where the two are ΔE00 34.8 apart against 35.2 for a trichromat — still clearly two colours.
Both colours have pages of their own: Sablé ·Acoustic Brown · the same pair the other way round ·all pairs