Matt Green on Black Sabbath
#39ad48 on #220022
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
6.64:1
Passes AA for body text
Not AAA (7:1). Swapping the two colours gives the same number — the ratio does not know which is the text.
APCA
Lc -46.2
Clears Lc 45 — large or heavy display text.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 73.9
different colours
Above 10 — related only in the sense that both are colours.
Nothing to fix
This pair already clears 4.5:1, so #39ad48 can stay exactly as it is. Check another pair.
And to someone missing a cone
protanopia
Ratio 7.63:1, ΔE00 65.7.
deuteranopia
Ratio 6.14:1, ΔE00 56.8.
tritanopia
Ratio 5.89:1, ΔE00 58.0.
The weakest of the three is deuteranopia, where the two are ΔE00 56.8 apart against 73.9 for a trichromat — still clearly two colours.
Both colours have pages of their own: Matt Green ·Black Sabbath · the same pair the other way round ·all pairs