Cherry on Top on Matt Green
#ac495c on #39ad48
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
1.88:1
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 19.7
Clears Lc 15 — disabled or purely decorative text, which is not meant to be read.
Dark text on a lighter ground.
Colour difference
ΔE00 67.1
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#670125 is the nearest colour of the same hue that passes AA on #39ad48, 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 2.59:1, ΔE00 36.2.
deuteranopia
Ratio 1.60:1, ΔE00 17.3.
tritanopia
Ratio 1.25:1, ΔE00 63.3.
The weakest of the three is deuteranopia, where the two are ΔE00 17.3 apart against 67.1 for a trichromat — still clearly two colours.
Both colours have pages of their own: Cherry on Top ·Matt Green · the same pair the other way round ·all pairs