#0B4599
Closest named color: Cobalt (#1E488F). oklch(41% 0.149 259.2), rgb(11, 69, 153).
Aa
White text reads best on this color (9.03:1).
About this color
#0B4599 is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.149 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.023 away. White text reads best on it, at 9.03:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.32:1 |
| White text | 9.03:1 |
Values
| HEX | #0B4599 |
| RGB | rgb(11, 69, 153) |
| HSL | hsl(215, 87%, 32%) |
| OKLCH | oklch(41% 0.149 259.2) |
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 #0B4599 | 9.03:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #0B4599 | 2.32:1 | Fails | Lc 13.9 | Not readable |
| #0B4599 text on white | 9.03:1 | AAA | Lc 90.1 | Preferred for body text |
| #0B4599 text on black | 2.32:1 | Fails | Lc -12.2 | 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 800.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9FC2F9
oklch(80.8% 0.087 259.3)
-
Step 400
400
#6AA0F6
oklch(70.6% 0.139 259.4)
-
Step 500
500
#4186F3
oklch(63.1% 0.178 259.3)
-
Step 600
600
#1E6CE2
oklch(55.5% 0.194 259.4)
-
Step 700
700
#105AC4
oklch(49.2% 0.179 259.2)
-
Step 800
800 (this color)
#0B4599
oklch(41% 0.149 259.2)
-
Step 900
900
#163F7E
oklch(37.7% 0.116 259.1)
-
Step 950
950
#0E254A
oklch(26.9% 0.075 259.5)
#0B4599 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) | #004F9C | 0.027 |
| Deuteranopia (no green cones) | #004397 | 0.008 |
| Tritanopia (no blue cones) | #005A68 | 0.113 |
| Achromatopsia (no color) | #494949 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B4599
#0B4599
oklch(41% 0.149 259.2)
- #634400
#634400
oklch(41.1% 0.085 79.1)
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 #0B4599, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.023
- Sapphire #2138AB ΔE 0.043
- Light Navy #155084 ΔE 0.050
- Twilight Blue #0A437A ΔE 0.052
- Dusk Blue #26538D ΔE 0.052
- Blueberry #464196 ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.068
Use #0B4599 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.