#0B4587
Closest named color: Cobalt (#1E488F). oklch(39.6% 0.124 255.7), rgb(11, 69, 135).
Aa
White text reads best on this color (9.47:1).
About this color
#0B4587 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.124 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.021 away. White text reads best on it, at 9.47:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.21:1 |
| White text | 9.47:1 |
Values
| HEX | #0B4587 |
| RGB | rgb(11, 69, 135) |
| HSL | hsl(212, 85%, 29%) |
| OKLCH | oklch(39.6% 0.124 255.7) |
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 #0B4587 | 9.47:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #0B4587 | 2.21:1 | Fails | Lc 12.6 | Not readable |
| #0B4587 text on white | 9.47:1 | AAA | Lc 91.4 | Preferred for body text |
| #0B4587 text on black | 2.21:1 | Fails | Lc -11.0 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFC
oklch(93.5% 0.027 255.1)
-
Step 200
200
#C3DBFC
oklch(88.4% 0.052 256.4)
-
Step 300
300
#99C3FC
oklch(80.8% 0.093 256.2)
-
Step 400
400
#5DA2FB
oklch(70.7% 0.149 255.6)
-
Step 500
500
#2787F9
oklch(63% 0.191 255.9)
-
Step 600
600
#0070DD
oklch(55.6% 0.187 255.6)
-
Step 700
700
#005EBC
oklch(49.2% 0.166 255.7)
-
Step 800
800
#004C9B
oklch(42.6% 0.144 255.8)
-
Step 900
900 (this color)
#0B4587
oklch(39.6% 0.124 255.7)
-
Step 950
950
#07264C
oklch(27.1% 0.079 255.8)
#0B4587 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) | #1F4B89 | 0.024 |
| Deuteranopia (no green cones) | #004186 | 0.013 |
| Tritanopia (no blue cones) | #00555F | 0.093 |
| Achromatopsia (no color) | #464646 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B4587
#0B4587
oklch(39.6% 0.124 255.7)
- #603F00
#603F00
oklch(39.6% 0.083 75.5)
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 #0B4587, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.021
- Twilight Blue #0A437A ΔE 0.022
- Light Navy #155084 ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.047
- Dusk Blue #26538D ΔE 0.048
- Marine Blue #01386A ΔE 0.061
- Blueberry #464196 ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.068
Use #0B4587 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.