#0B66ED
Closest named color: Cerulean Blue (#056EEE). oklch(54.9% 0.218 260.1), rgb(11, 102, 237).
Aa
White text reads best on this color (5.07:1).
About this color
#0B66ED is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.218 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.019 away. White text reads best on it, at 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.218) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.13:1 |
| White text | 5.07:1 |
Values
| HEX | #0B66ED |
| RGB | rgb(11, 102, 237) |
| HSL | hsl(216, 91%, 49%) |
| OKLCH | oklch(54.9% 0.218 260.1) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #0B66ED | 5.07:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #0B66ED | 4.13:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #0B66ED text on white | 5.07:1 | AA | Lc 74.1 | Content text, not long reading |
| #0B66ED text on black | 4.13:1 | AA large text | Lc -27.6 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C5DAFE
oklch(88.4% 0.055 261.2)
-
Step 300
300
#9DC2FF
oklch(81% 0.096 260.2)
-
Step 400
400
#669FFF
oklch(70.7% 0.154 260.3)
-
Step 500
500
#3983FF
oklch(63.1% 0.199 260.2)
-
Step 600
600 (this color)
#0B66ED
oklch(54.9% 0.218 260.1)
-
Step 700
700
#0056D0
oklch(49.2% 0.201 260.1)
-
Step 800
800
#0747A8
oklch(42.7% 0.167 260.1)
-
Step 900
900
#113D85
oklch(37.7% 0.13 260.1)
-
Step 950
950
#0C244E
oklch(26.9% 0.083 260.7)
#0B66ED with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #0078F2 | 0.044 |
| Deuteranopia (no green cones) | #0065EA | 0.006 |
| Tritanopia (no blue cones) | #0089A0 | 0.166 |
| Achromatopsia (no color) | #6E6E6E | 0.218 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B66ED
#0B66ED
oklch(54.9% 0.218 260.1)
- #946800
#946800
oklch(54.9% 0.114 79.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #0B66ED, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.019
- Azul #1D5DEC ΔE 0.020
- Bright Blue #0165FC ΔE 0.023
- Neon Blue #4361EE ΔE 0.034
- Royal Blue #4169E1 ΔE 0.039
- Electric Blue #0652FF ΔE 0.051
- Warm Blue #4B57DB ΔE 0.056
- Clear Blue #247AFD ΔE 0.057
Use #0B66ED in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.