Flirt on Panorama
#7a2e4d on #327a88
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
1.84:1
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 14.4
Below Lc 15: the draft treats this as not text.
Dark text on a lighter ground.
Colour difference
ΔE00 48.8
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#fff2f6 is the nearest colour of the same hue that passes AA on #327a88, 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 2.36:1, ΔE00 20.0.
deuteranopia
Ratio 1.62:1, ΔE00 19.0.
tritanopia
Ratio 1.38:1, ΔE00 60.8.
The weakest of the three is deuteranopia, where the two are ΔE00 19.0 apart against 48.8 for a trichromat — still clearly two colours.
Both colours have pages of their own: Flirt ·Panorama · the same pair the other way round ·all pairs