#0B4580
Closest named color: Twilight Blue (#0A437A). oklch(39% 0.114 253.7), rgb(11, 69, 128).
Aa
White text reads best on this color (9.64:1).
About this color
#0B4580 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.114 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.011 away. White text reads best on it, at 9.64:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.17:1 |
| White text | 9.64:1 |
Values
| HEX | #0B4580 |
| RGB | rgb(11, 69, 128) |
| HSL | hsl(210, 84%, 27%) |
| OKLCH | oklch(39% 0.114 253.7) |
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 #0B4580 | 9.64:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #0B4580 | 2.17:1 | Fails | Lc 12.1 | Not readable |
| #0B4580 text on white | 9.64:1 | AAA | Lc 91.8 | Preferred for body text |
| #0B4580 text on black | 2.17:1 | Fails | Lc -10.5 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C4DCF9
oklch(88.6% 0.048 253.2)
-
Step 300
300
#9AC4F7
oklch(80.9% 0.085 253.6)
-
Step 400
400
#60A3F4
oklch(70.6% 0.138 254.2)
-
Step 500
500
#2B8AEF
oklch(63.1% 0.174 253.6)
-
Step 600
600
#0072D6
oklch(55.6% 0.176 253.8)
-
Step 700
700
#0060B5
oklch(49.2% 0.155 253.6)
-
Step 800
800
#004E96
oklch(42.7% 0.135 253.8)
-
Step 900
900 (this color)
#0B4580
oklch(39% 0.114 253.7)
-
Step 950
950
#082749
oklch(27.1% 0.073 253.8)
#0B4580 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) | #254A82 | 0.026 |
| Deuteranopia (no green cones) | #0B407F | 0.015 |
| Tritanopia (no blue cones) | #00535C | 0.084 |
| Achromatopsia (no color) | #454545 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B4580
#0B4580
oklch(39% 0.114 253.7)
- #5F3D00
#5F3D00
oklch(39% 0.083 73.8)
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 #0B4580, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.011
- Cobalt #1E488F ΔE 0.030
- Light Navy #155084 ΔE 0.034
- Deep Sea Blue #015482 ΔE 0.045
- Dusk Blue #26538D ΔE 0.051
- Marine Blue #01386A ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.067
- Dark Slate Blue #483D8B ΔE 0.071
Use #0B4580 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.