#0B3966
Closest named color: Marine Blue (#01386A). oklch(34.1% 0.092 252.3), rgb(11, 57, 102).
Aa
White text reads best on this color (11.72:1).
About this color
#0B3966 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.092 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.010 away. White text reads best on it, at 11.72:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.79:1 |
| White text | 11.72:1 |
Values
| HEX | #0B3966 |
| RGB | rgb(11, 57, 102) |
| HSL | hsl(210, 81%, 22%) |
| OKLCH | oklch(34.1% 0.092 252.3) |
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 #0B3966 | 11.72:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #0B3966 | 1.79:1 | Fails | Lc 7.4 | Not readable |
| #0B3966 text on white | 11.72:1 | AAA | Lc 96.5 | Preferred for body text |
| #0B3966 text on black | 1.79:1 | Fails | Lc 0.0 | Not readable |
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 900.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF2
oklch(88.4% 0.038 253.2)
-
Step 300
300
#A1C4ED
oklch(80.9% 0.069 252.7)
-
Step 400
400
#6CA4E4
oklch(70.6% 0.111 252.6)
-
Step 500
500
#428CDC
oklch(63.1% 0.142 252.5)
-
Step 600
600
#1C75C9
oklch(55.7% 0.152 252)
-
Step 700
700
#0B61AE
oklch(49% 0.143 252.4)
-
Step 800
800
#10508D
oklch(42.8% 0.118 252.2)
-
Step 900
900 (this color)
#0B3966
oklch(34.1% 0.092 252.3)
-
Step 950
950
#0F2742
oklch(26.9% 0.059 253.1)
#0B3966 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) | #223C68 | 0.024 |
| Deuteranopia (no green cones) | #123465 | 0.015 |
| Tritanopia (no blue cones) | #00444A | 0.069 |
| Achromatopsia (no color) | #383838 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B3966
#0B3966
oklch(34.1% 0.092 252.3)
- #4F3100
#4F3100
oklch(34.1% 0.073 72.4)
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 #0B3966, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.010
- Prussian Blue #1D3557 ΔE 0.029
- Marine #042E60 ΔE 0.036
- Twilight Blue #0A437A ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.048
- Midnight Green #073B4C ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.059
- Charcoal #264653 ΔE 0.066
Use #0B3966 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.