HueComb

Deep Sky Blue

#0d75f8

A blue that is saturated. It is mid — the hardest range to put text on, either colour struggles.

Hex

#0d75f8

RGB

13, 117, 248

OKLCh

58.8% 0.214 258.3°

CIELAB (D50)

50.1, 13.1, -74.2

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 68.7; on black, Lc -33.0. 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.
  • protanopia and deuteranopia and tritanopia shift it by ΔE00 12.0 and 12.1 and 13.7 — no red cone.

Text on this colour

White text

4.27:1 — large text only

Black text

4.92:1 — passes AA

Black text is the better of the two at4.92:1. That is enough for body text.

As text on white, it needs to change

#0471f4 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

#0d75f8

protanopia

#6f6ff8 · ΔE00 12.0

deuteranopia

#6464f8 · ΔE00 12.1

tritanopia

#5656ff · ΔE00 13.7

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isBlue Sparkle at ΔE00 0.975: below 1.0 — an ordinary observer cannot tell these apart, even side by side. 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.