HueComb

Vibrant Blue

#0339f8

A blue that is about as vivid as sRGB can show at this lightness. It is mid — the hardest range to put text on, either colour struggles.

Hex

#0339f8

RGB

3, 57, 248

OKLCh

48.4% 0.279 264.1°

CIELAB (D50)

35.3, 48.1, -98.6

What is true of this colour, and of no other

  • 4 other named colours sit within ΔE00 2 of it.
  • It uses 96% 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 82.9; on black, Lc -19.0. 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.
  • All three dichromacies see it as very nearly the same colour you do: its hue is not the part carrying its identity.

Text on this colour

White text

7.13:1 — passes AA

Black text

2.94:1 — fails AA

White text is the better of the two at7.13:1. That is enough for body text.

The same colour, with one cone missing

As you see it

#0339f8

protanopia

#3636f8 · ΔE00 2.7

deuteranopia

#3030f8 · ΔE00 3.0

tritanopia

#2828ff · ΔE00 3.8

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isC64 Blue at ΔE00 0.845: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

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