Acoustic Brown on Frozen Forest
#766b69 on #cfe8b6
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
3.89:1
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 57.2
Clears Lc 45 — large or heavy display text.
Dark text on a lighter ground.
Colour difference
ΔE00 41.5
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#6c615f is the nearest colour of the same hue that passes AA on #cfe8b6, 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 4.06:1, ΔE00 38.1.
deuteranopia
Ratio 3.80:1, ΔE00 35.7.
tritanopia
Ratio 3.84:1, ΔE00 48.8.
The weakest of the three is deuteranopia, where the two are ΔE00 35.7 apart against 41.5 for a trichromat — still clearly two colours.
Both colours have pages of their own: Acoustic Brown ·Frozen Forest · the same pair the other way round ·all pairs