Soothing Sapphire
#307dd3
A blue that is saturated. It is mid — the hardest range to put text on, either colour struggles.
Hex
#307dd3
RGB
48, 125, 211
OKLCh
58.6% 0.152 253.9°
CIELAB (D50)
51.0, -0.6, -52.0
What is true of this colour, and of no other
- 2 other named colours sit within ΔE00 2 of it.
- It uses 82% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 68.6; on black, Lc -33.1. 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 14.3 and 13.9 and 14.2 — no red cone.
Text on this colour
White text
4.20:1 — large text only
Black text
5.00:1 — passes AA
Black text is the better of the two at5.00:1. That is enough for body text.
As text on white, it needs to change
#2a78cd is the nearest colour of the same hue that passes AA on white, at 4.50:1. Only the lightness moved.
The same colour, with one cone missing
As you see it
#307dd3
protanopia
#7777d3 · ΔE00 14.3
deuteranopia
#6d6dd4 · ΔE00 13.9
tritanopia
#6161ff · ΔE00 14.2
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isHeirloom Hydrangea at ΔE00 0.886: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Heirloom HydrangeaΔE00 0.886 · #327ccb
- Tufts BlueΔE00 1.951 · #417dc1
- Celestial PlumΔE00 2.048 · #3c7ac2
- Worn DenimΔE00 2.365 · #4282c6
- MykonosΔE00 2.372 · #387abe
- Fading NightΔE00 2.377 · #3377cc
- Blue-Eyed BoyΔE00 2.5 · #2277cc
- Windows BlueΔE00 2.653 · #3778bf
- ParkwaterΔE00 2.951 · #477bbd
- Blue DarknutΔE00 3.196 · #0078f8
- Amalfi CoastΔE00 3.215 · #297cbf
- Bright Navy BlueΔE00 3.332 · #1974d2
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.