Fading Night
#3377cc
A blue that is muted. It is mid — the hardest range to put text on, either colour struggles.
Hex
#3377cc
RGB
51, 119, 204
OKLCh
56.9% 0.148 255.6°
CIELAB (D50)
49.0, 1.1, -51.2
What is true of this colour, and of no other
- 5 other named colours sit within ΔE00 2 of it.
- It uses 77% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 71.0; on black, Lc -30.7. 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 13.1 and 12.8 and 13.1 — no red cone.
Text on this colour
White text
4.51:1 — passes AA
Black text
4.65:1 — passes AA
Black text is the better of the two at4.65:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#3377cc
protanopia
#7272cc · ΔE00 13.1
deuteranopia
#6969cd · ΔE00 12.8
tritanopia
#5d5dff · ΔE00 13.1
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isCelestial Plum at ΔE00 1.448: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Celestial PlumΔE00 1.448 · #3c7ac2
- Windows BlueΔE00 1.46 · #3778bf
- Blue-Eyed BoyΔE00 1.623 · #2277cc
- Bright Navy BlueΔE00 1.752 · #1974d2
- Palace BlueΔE00 1.949 · #3973c0
- MykonosΔE00 2.028 · #387abe
- Heirloom HydrangeaΔE00 2.035 · #327ccb
- Soothing SapphireΔE00 2.377 · #307dd3
- ParkwaterΔE00 2.448 · #477bbd
- Tufts BlueΔE00 2.474 · #417dc1
- PetrelΔE00 2.497 · #4076b4
- CampanulaΔE00 2.662 · #3473b7
9 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.