Matt Green on Flirt
#39ad48 on #7a2e4d
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
3.12:1
Large text only
Not AAA (7:1). Swapping the two colours gives the same number — the ratio does not know which is the text.
APCA
Lc -33.7
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 70.8
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#5dce68 is the nearest colour of the same hue that passes AA on #7a2e4d, 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 4.10:1, ΔE00 52.2.
deuteranopia
Ratio 2.71:1, ΔE00 33.6.
tritanopia
Ratio 2.22:1, ΔE00 62.6.
The weakest of the three is deuteranopia, where the two are ΔE00 33.6 apart against 70.8 for a trichromat — still clearly two colours.
Both colours have pages of their own: Matt Green ·Flirt · the same pair the other way round ·all pairs