Emerald Ice Palace

#2af589

A green that is saturated. It is very light — it works as a page background, not as text.

Hex

#2af589

RGB

42, 245, 137

OKLCh

85.4% 0.211 153.0°

CIELAB (D50)

85.8, -66.4, 38.0

What is true of this colour, and of no other

4 other named colours sit within ΔE00 2 of it.
It uses 96% of the chroma sRGB can show at this lightness and hue — close enough to the boundary that a wider display would show it slightly more vividly.
As text on white it measures APCA Lc 20.7; on black, Lc -82.7. The sign is the polarity, which the WCAG ratio discards.
Built into an eleven-step scale, 10 of the 10 adjacent pairs stay ΔE00 2 apart — see the ramp.
protanopia and deuteranopia and tritanopia shift it by ΔE00 24.6 and 23.9 and 47.3 — no red cone.

Text on this colour

White text

1.45:1 — fails AA

Black text

14.52:1 — passes AA

Black text is the better of the two at14.52:1. That is enough for body text.

As text on white, it needs to change

#008948 is the nearest colour of the same hue that passes AA on white, at 4.50:1. Only the lightness moved, and some saturation was given up to stay inside sRGB.

Try it against your own background

The same colour, with one cone missing

As you see it

#2af589

protanopia

#e9e988 · ΔE00 24.6

deuteranopia

#d3d38e · ΔE00 23.9

tritanopia

#b7b7ff · ΔE00 47.3

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isTurquoise Green at ΔE00 0.718: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

Turquoise GreenΔE00 0.718 · #04f489
WintergreenΔE00 1.132 · #20f986
Ahaetulla PrasinaΔE00 1.617 · #00fa92
Minty GreenΔE00 1.822 · #0bf77d
Thallium FlameΔE00 2.363 · #58f898
Eva GreenΔE00 2.566 · #36ff9a
Atomic SpringΔE00 2.684 · #00fa9a
Green GasΔE00 2.696 · #00ff99
Synthetic SpearmintΔE00 2.923 · #1ef876
Guppie GreenΔE00 2.978 · #00ff7f
Spring GreenΔE00 3.268 · #00ff7c
Sea GreenΔE00 3.277 · #53fca1

12 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.