Futon

#edf6db

A yellow 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

#edf6db

RGB

237, 246, 219

OKLCh

95.9% 0.037 122.1°

CIELAB (D50)

95.7, -6.5, 12.0

What is true of this colour, and of no other

13 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 31% 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 -99.5. 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.
tritanopia shifts it by ΔE00 14.5 — no blue cone.

Text on this colour

White text

1.12:1 — fails AA

Black text

18.81:1 — passes AA

Black text is the better of the two at18.81:1. That is enough for body text.

As text on white, it needs to change

#727a62 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

#edf6db

protanopia

#f5f5db · ΔE00 3.8

deuteranopia

#f3f3db · ΔE00 3.9

tritanopia

#f2f2f7 · ΔE00 14.5

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isWishy-Washy Lime at ΔE00 0.843: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

Wishy-Washy LimeΔE00 0.843 · #eef5db
Tokyo UndergroundΔE00 0.953 · #ecf3d8
Diminished LimeΔE00 1.027 · #edf5dd
Old Kitchen WhiteΔE00 1.335 · #eff5dc
Lemon SugarΔE00 1.347 · #f0f6dd
Theatre District LightsΔE00 1.355 · #eef4db
White WillowΔE00 1.367 · #ecf4dd
Minified LimeΔE00 1.395 · #ebf5de
Spring MornΔE00 1.559 · #e5f0d5
Diminished MintΔE00 1.803 · #e9f3dd
Translucent VisionΔE00 1.808 · #e5efd7
Overexposed ShotΔE00 1.861 · #eff4dc

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