God of Rain on Frozen Forest
#4466cc 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
3.95:1
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 58.8
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#3c5dc2 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 3.89:1, ΔE00 59.5.
deuteranopia
Ratio 3.98:1, ΔE00 59.5.
tritanopia
Ratio 3.96:1, ΔE00 39.9.
The weakest of the three is tritanopia, where the two are ΔE00 39.9 apart against 58.8 for a trichromat — still clearly two colours.
Both colours have pages of their own: God of Rain ·Frozen Forest · the same pair the other way round ·all pairs