Ms. Pac-Man Kiss on God of Rain
#ff00aa on #4466cc
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
1.45:1
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 -14.0
Below Lc 15: the draft treats this as not text.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 41.3
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#ffe8f2 is the nearest colour of the same hue that passes AA on #4466cc, at 4.50:1. Only the lightness moved, and some chroma was given up to stay inside sRGB — which is the point: your colour stays recognisably your colour.
And to someone missing a cone
protanopia
Ratio 1.14:1, ΔE00 5.1.
deuteranopia
Ratio 1.78:1, ΔE00 25.1.
tritanopia
Ratio 2.55:1, ΔE00 76.2.
The weakest of the three is protanopia, where the two are ΔE00 5.1 apart against 41.3 for a trichromat — still two colours, but a closer call than it looks to you.
Both colours have pages of their own: Ms. Pac-Man Kiss ·God of Rain · the same pair the other way round ·all pairs