HueComb

Cobalt

#030aa7

A blue that is about as vivid as sRGB can show at this lightness. It is dark — it carries white text and needs care with black.

Hex

#030aa7

RGB

3, 10, 167

OKLCh

33.6% 0.224 264.6°

CIELAB (D50)

18.3, 46.9, -79.8

What is true of this colour, and of no other

  • 6 other named colours sit within ΔE00 2 of it.
  • It uses 97% 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 96.9; on black, Lc 0.0. 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

13.08:1 — passes AA

Black text

1.61:1 — fails AA

White text is the better of the two at13.08:1. That is enough for body text.

The same colour, with one cone missing

As you see it

#030aa7

protanopia

#0909a7 · ΔE00 0.3

deuteranopia

#0808a7 · ΔE00 0.3

tritanopia

#0707a8 · ΔE00 0.4

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isTraditional Royal Blue at ΔE00 0.705: 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.