Corrosive Green on Olympian Blue
#54d905 on #1c4c8c
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
4.59:1
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 -53.7
Clears Lc 45 — large or heavy display text.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 72.9
different colours
Above 10 — related only in the sense that both are colours.
Nothing to fix
This pair already clears 4.5:1, so #54d905 can stay exactly as it is. Check another pair.
And to someone missing a cone
protanopia
Ratio 4.86:1, ΔE00 74.0.
deuteranopia
Ratio 4.44:1, ΔE00 73.8.
tritanopia
Ratio 4.03:1, ΔE00 40.8.
The weakest of the three is tritanopia, where the two are ΔE00 40.8 apart against 72.9 for a trichromat — still clearly two colours.
Both colours have pages of their own: Corrosive Green ·Olympian Blue · the same pair the other way round ·all pairs