Delicate Ice

#b7d2e3

A blue 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

#b7d2e3

RGB

183, 210, 227

OKLCh

84.9% 0.037 235.5°

CIELAB (D50)

82.6, -6.7, -11.6

What is true of this colour, and of no other

18 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 43% of the chroma sRGB can show at this lightness and hue.
As text on white it measures APCA Lc 26.2; on black, Lc -76.9. 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 11.6 and 12.3 and 13.8 — no red cone.

Text on this colour

White text

1.57:1 — fails AA

Black text

13.34:1 — passes AA

Black text is the better of the two at13.34:1. That is enough for body text.

As text on white, it needs to change

#617a8a 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

#b7d2e3

protanopia

#cfcfe3 · ΔE00 11.6

deuteranopia

#cbcbe3 · ΔE00 12.3

tritanopia

#c5c5ff · ΔE00 13.8

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isTiny Mr Frosty at ΔE00 0.241: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

Tiny Mr FrostyΔE00 0.241 · #b8d3e4
Light Sea CliffΔE00 0.919 · #b9d4e7
Crystal WatersΔE00 0.977 · #b4cedf
OmphalodesΔE00 1.083 · #b5cedf
Cache BlueΔE00 1.226 · #b5cee0
Norwegian SkyΔE00 1.29 · #b4cdde
Beau BlueΔE00 1.34 · #bcd4e6
Light Tidal FoamΔE00 1.394 · #bcd6e9
Light TemplateΔE00 1.514 · #bbd6ea
Tender TwilightΔE00 1.562 · #b7cfe2
Holiday RoadΔE00 1.586 · #b1d1e2
Pale AquaΔE00 1.638 · #bcd4e1

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