#0B3B81
Closest named color: Twilight Blue (#0A437A). oklch(36.7% 0.128 259), rgb(11, 59, 129).
Aa
White text reads best on this color (10.73:1).
About this color
#0B3B81 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.128 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 10.73:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.73:1 |
Values
| HEX | #0B3B81 |
| RGB | rgb(11, 59, 129) |
| HSL | hsl(216, 84%, 27%) |
| OKLCH | oklch(36.7% 0.128 259) |
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 #0B3B81 | 10.73:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #0B3B81 | 1.95:1 | Fails | Lc 9.6 | Not readable |
| #0B3B81 text on white | 10.73:1 | AAA | Lc 94.3 | Preferred for body text |
| #0B3B81 text on black | 1.95:1 | Fails | Lc -8.3 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C4DBFD
oklch(88.5% 0.053 258)
-
Step 300
300
#9BC2FF
oklch(80.8% 0.097 259.2)
-
Step 400
400
#63A0FF
oklch(70.7% 0.154 259)
-
Step 500
500
#3584FE
oklch(63.1% 0.198 259.2)
-
Step 600
600
#036AED
oklch(55.6% 0.214 259)
-
Step 700
700
#0058CA
oklch(49.1% 0.191 259.1)
-
Step 800
800
#0148A7
oklch(42.7% 0.165 259.1)
-
Step 900
900 (this color)
#0B3B81
oklch(36.7% 0.128 259)
-
Step 950
950
#0B254D
oklch(27% 0.081 259)
#0B3B81 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) | #054383 | 0.022 |
| Deuteranopia (no green cones) | #003980 | 0.009 |
| Tritanopia (no blue cones) | #004C58 | 0.097 |
| Achromatopsia (no color) | #3E3E3E | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B3B81
#0B3B81
oklch(36.7% 0.128 259)
- #543900
#543900
oklch(36.6% 0.076 78.9)
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 #0B3B81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Marine Blue #01386A ΔE 0.041
- Cobalt #1E488F ΔE 0.047
- Light Navy #155084 ΔE 0.063
- Marine #042E60 ΔE 0.067
- Sapphire #2138AB ΔE 0.072
- Prussian Blue #1D3557 ΔE 0.073
- Deep Sea Blue #015482 ΔE 0.074
Use #0B3B81 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.