Olympian Blue on Double Denim
#1c4c8c on #95bce1
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
4.29:1
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 48.4
Clears Lc 45 — large or heavy display text.
Dark text on a lighter ground.
Colour difference
ΔE00 41.8
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#194989 is the nearest colour of the same hue that passes AA on #95bce1, 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 4.24:1, ΔE00 41.0.
deuteranopia
Ratio 4.32:1, ΔE00 42.3.
tritanopia
Ratio 4.09:1, ΔE00 41.2.
The weakest of the three is protanopia, where the two are ΔE00 41.0 apart against 41.8 for a trichromat — still clearly two colours.
Both colours have pages of their own: Olympian Blue ·Double Denim · the same pair the other way round ·all pairs