Dragon’s Fire on Master Sword Blue
#fc4a14 on #00ffee
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
2.70:1
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 45.3
Clears Lc 45 — large or heavy display text.
Dark text on a lighter ground.
Colour difference
ΔE00 68.7
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#c03100 is the nearest colour of the same hue that passes AA on #00ffee, 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 4.48:1, ΔE00 42.4.
deuteranopia
Ratio 2.14:1, ΔE00 42.9.
tritanopia
Ratio 1.12:1, ΔE00 55.5.
The weakest of the three is protanopia, where the two are ΔE00 42.4 apart against 68.7 for a trichromat — still clearly two colours.
Both colours have pages of their own: Dragon’s Fire ·Master Sword Blue · the same pair the other way round ·all pairs