Darkest Forest on Grapest
#223311 on #880066
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
1.44:1
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 8.4
Below Lc 15: the draft treats this as not text.
Dark text on a lighter ground.
Colour difference
ΔE00 52.0
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#a5ba93 is the nearest colour of the same hue that passes AA on #880066, 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 1.08:1, ΔE00 39.1.
deuteranopia
Ratio 1.65:1, ΔE00 29.4.
tritanopia
Ratio 2.11:1, ΔE00 42.2.
The weakest of the three is deuteranopia, where the two are ΔE00 29.4 apart against 52.0 for a trichromat — still clearly two colours.
Both colours have pages of their own: Darkest Forest ·Grapest · the same pair the other way round ·all pairs