Hint of Blue on Out of the Blue
#cee1f2 on #1199ee
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
2.30:1
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 -41.5
Clears Lc 30 — the floor: below this the draft considers text not readable at any size.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 26.5
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#1f2e3b is the nearest colour of the same hue that passes AA on #1199ee, 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 2.13:1, ΔE00 25.1.
deuteranopia
Ratio 2.40:1, ΔE00 27.9.
tritanopia
Ratio 2.76:1, ΔE00 30.6.
The weakest of the three is protanopia, where the two are ΔE00 25.1 apart against 26.5 for a trichromat — still clearly two colours.
Both colours have pages of their own: Hint of Blue ·Out of the Blue · the same pair the other way round ·all pairs