HueComb

Blue Öyster Cult

#5577ee

A blue that is saturated. It is light — black text sits on it comfortably, white text does not.

Hex

#5577ee

RGB

85, 119, 238

OKLCh

60.6% 0.183 268.5°

CIELAB (D50)

52.3, 16.9, -65.0

What is true of this colour, and of no other

  • No other named colour in the set is within ΔE00 2 of it — it stands alone.
  • It uses 86% of the chroma sRGB can show at this lightness and hue — close enough to the boundary that a wider display would show it slightly more vividly.
  • As text on white it measures APCA Lc 66.9; on black, Lc -34.8. 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 6.4 and 6.3 and 6.7 — no red cone.

Text on this colour

White text

3.99:1 — large text only

Black text

5.26:1 — passes AA

Black text is the better of the two at5.26:1. That is enough for body text.

As text on white, it needs to change

#4d6ee4 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

#5577ee

protanopia

#7474ee · ΔE00 6.4

deuteranopia

#6e6eee · ΔE00 6.3

tritanopia

#6868ff · ΔE00 6.7

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isPan Purple at ΔE00 2.756: between 2 and 5 — clearly two colours when compared, easily mistaken from memory. What the numbers mean.

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