#0B3A64
Closest named color: Marine Blue (#01386A). oklch(34.2% 0.088 250.4), rgb(11, 58, 100).
Aa
White text reads best on this color (11.64:1).
About this color
#0B3A64 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.088 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.014 away. White text reads best on it, at 11.64:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.80:1 |
| White text | 11.64:1 |
Values
| HEX | #0B3A64 |
| RGB | rgb(11, 58, 100) |
| HSL | hsl(208, 80%, 22%) |
| OKLCH | oklch(34.2% 0.088 250.4) |
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 #0B3A64 | 11.64:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #0B3A64 | 1.80:1 | Fails | Lc 7.5 | Not readable |
| #0B3A64 text on white | 11.64:1 | AAA | Lc 96.4 | Preferred for body text |
| #0B3A64 text on black | 1.80:1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DCF1
oklch(88.6% 0.036 249.5)
-
Step 300
300
#A1C4EA
oklch(80.8% 0.066 250.7)
-
Step 400
400
#6CA5E0
oklch(70.6% 0.106 250.3)
-
Step 500
500
#428DD8
oklch(63.1% 0.136 250.9)
-
Step 600
600
#1B76C5
oklch(55.6% 0.147 250.4)
-
Step 700
700
#0963AA
oklch(49.2% 0.136 250.1)
-
Step 800
800
#0F518A
oklch(42.8% 0.113 250.3)
-
Step 900
900 (this color)
#0B3A64
oklch(34.2% 0.088 250.4)
-
Step 950
950
#0F2841
oklch(27.1% 0.056 250.6)
#0B3A64 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) | #253D66 | 0.027 |
| Deuteranopia (no green cones) | #173563 | 0.016 |
| Tritanopia (no blue cones) | #00444A | 0.064 |
| Achromatopsia (no color) | #383838 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B3A64
#0B3A64
oklch(34.2% 0.088 250.4)
- #503100
#503100
oklch(34.3% 0.074 71.3)
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 #0B3A64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.014
- Prussian Blue #1D3557 ΔE 0.027
- Marine #042E60 ΔE 0.038
- Twilight Blue #0A437A ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.044
- Midnight Green #073B4C ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.055
- Charcoal #264653 ΔE 0.061
Use #0B3A64 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.