Quick-Freeze

#bddbe1

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

#bddbe1

RGB

189, 219, 225

OKLCh

87.1% 0.033 211.1°

CIELAB (D50)

85.3, -9.4, -6.5

What is true of this colour, and of no other

25 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 29% 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 21.9; on black, Lc -81.4. 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 12.3 and 13.3 and 18.6 — no red cone.

Text on this colour

White text

1.46:1 — fails AA

Black text

14.38:1 — passes AA

Black text is the better of the two at14.38:1. That is enough for body text.

As text on white, it needs to change

#607b81 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

#bddbe1

protanopia

#d8d8e1 · ΔE00 12.3

deuteranopia

#d3d3e2 · ΔE00 13.3

tritanopia

#cdcdff · ΔE00 18.6

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isLight Sky Chase at ΔE00 1.013: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.

Light Sky ChaseΔE00 1.013 · #bad7dc
Ice Shard Soft BlueΔE00 1.106 · #c1dee2
Everglade MistΔE00 1.201 · #b7d7de
Infinitesimal BlueΔE00 1.209 · #bddde1
Alexandrian SkyΔE00 1.351 · #bcd9dc
Tender WavesΔE00 1.387 · #badbdf
Disappearing IslandΔE00 1.441 · #bbdee5
Washing Powder WhiteΔE00 1.494 · #c2dce3
Trevi FountainΔE00 1.571 · #c2dfe2
Blue PerennialΔE00 1.625 · #bcd7df
Delicate TurquoiseΔE00 1.631 · #c0dfe2
GalacticaΔE00 1.654 · #c4dde2

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