Polar

#e5f2e7

A neutral that has no useful hue — it reads as a grey. It is very light — it works as a page background, not as text.

Hex

#e5f2e7

RGB

229, 242, 231

OKLCh

94.8% 0.020 150.1°

CIELAB (D50)

94.3, -5.9, 3.8

What is true of this colour, and of no other

37 other named colours sit within ΔE00 2 of it — this part of the space is crowded, and the names here are finer distinctions than most people make.
It uses only 23% of the chroma available at this lightness and hue — there is a far more vivid version of this colour inside sRGB.
As text on white it measures APCA Lc 0.0; on black, Lc -97.1. 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 5.8 and 6.1 and 15.0 — no red cone.

Text on this colour

White text

1.15:1 — fails AA

Black text

18.19:1 — passes AA

Black text is the better of the two at18.19:1. That is enough for body text.

As text on white, it needs to change

#6e7a70 is the nearest colour of the same hue that passes AA on white, at 4.50:1. Only the lightness moved.

Try it against your own background

The same colour, with one cone missing

As you see it

#e5f2e7

protanopia

#f1f1e7 · ΔE00 5.8

deuteranopia

#eeeee7 · ΔE00 6.1

tritanopia

#ececff · ΔE00 15.0

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isMint Fizz at ΔE00 0.444: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

Mint FizzΔE00 0.444 · #e6f3e7
Molly GreenΔE00 0.83 · #e3efe3
Aqua SpringΔE00 0.862 · #e8f3e8
Icy PistachioΔE00 0.914 · #e6f2e9
Stone PathΔE00 1.033 · #e4efe5
Green WhisperΔE00 1.095 · #e3eee3
Soothing VapourΔE00 1.136 · #e1efe2
Lower GreenΔE00 1.147 · #e0efe3
DewΔE00 1.154 · #e7f2e9
Quark WhiteΔE00 1.217 · #e7f1e6
Weak MintΔE00 1.29 · #e0f0e5
Bath BubblesΔE00 1.31 · #e6f2ea

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