Dwarf Fortress on Atlas Cedar
#1d0200 on #5ca0a7
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
6.64:1
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 47.2
Clears Lc 45 — large or heavy display text.
Dark text on a lighter ground.
Colour difference
ΔE00 62.5
different colours
Above 10 — related only in the sense that both are colours.
Nothing to fix
This pair already clears 4.5:1, so #1d0200 can stay exactly as it is. Check another pair.
And to someone missing a cone
protanopia
Ratio 7.31:1, ΔE00 50.7.
deuteranopia
Ratio 6.29:1, ΔE00 48.1.
tritanopia
Ratio 6.02:1, ΔE00 57.2.
The weakest of the three is deuteranopia, where the two are ΔE00 48.1 apart against 62.5 for a trichromat — still clearly two colours.
Both colours have pages of their own: Dwarf Fortress ·Atlas Cedar · the same pair the other way round ·all pairs