Black Box on Out of the Blue
#0f282f 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
4.99:1
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 43.1
Clears Lc 30 — the floor: below this the draft considers text not readable at any size.
Dark text on a lighter ground.
Colour difference
ΔE00 42.7
different colours
Above 10 — related only in the sense that both are colours.
Nothing to fix
This pair already clears 4.5:1, so #0f282f can stay exactly as it is. Check another pair.
And to someone missing a cone
protanopia
Ratio 5.35:1, ΔE00 45.7.
deuteranopia
Ratio 4.80:1, ΔE00 41.9.
tritanopia
Ratio 4.05:1, ΔE00 34.5.
The weakest of the three is tritanopia, where the two are ΔE00 34.5 apart against 42.7 for a trichromat — still clearly two colours.
Both colours have pages of their own: Black Box ·Out of the Blue · the same pair the other way round ·all pairs