Cotton Clouds

#c2e1ec

A cyan that is nearly neutral — the hue shows only against a true grey. It is very light — it works as a page background, not as text.

Hex

#c2e1ec

RGB

194, 225, 236

OKLCh

89.1% 0.036 221.2°

CIELAB (D50)

87.5, -8.9, -9.0

What is true of this colour, and of no other

14 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 47% of the chroma sRGB can show at this lightness and hue.
As text on white it measures APCA Lc 18.3; on black, Lc -85.3. 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 12.7 and 13.7 and 16.8 — no red cone.

Text on this colour

White text

1.37:1 — fails AA

Black text

15.28:1 — passes AA

Black text is the better of the two at15.28:1. That is enough for body text.

As text on white, it needs to change

#5f7b85 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

#c2e1ec

protanopia

#dedeec · ΔE00 12.7

deuteranopia

#d9d9ed · ΔE00 13.7

tritanopia

#d2d2ff · ΔE00 16.8

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isSkywalker at ΔE00 1.016: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.

SkywalkerΔE00 1.016 · #c1deea
SkylarkΔE00 1.179 · #c1e4f0
Breeze in JuneΔE00 1.256 · #c4dfe8
Serene SkyΔE00 1.415 · #c3e3eb
BreezyΔE00 1.431 · #c2dde6
SapphireberryΔE00 1.433 · #c9e5ee
Alpine AlabasterΔE00 1.59 · #badbe6
Surf’s UpΔE00 1.736 · #c6e4eb
Delicate BlueΔE00 1.751 · #bcdfe8
Azul Cielito LindoΔE00 1.762 · #c9e3eb
Breezy BlueΔE00 1.881 · #bad9e5
Diminished BlueΔE00 1.886 · #bce1eb

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