#0B4B8B
Closest named color: Cobalt (#1E488F). oklch(41.3% 0.122 253.7), rgb(11, 75, 139).
Aa
White text reads best on this color (8.77:1).
About this color
#0B4B8B is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.122 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.015 away. White text reads best on it, at 8.77:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.39:1 |
| White text | 8.77:1 |
Values
| HEX | #0B4B8B |
| RGB | rgb(11, 75, 139) |
| HSL | hsl(210, 85%, 29%) |
| OKLCH | oklch(41.3% 0.122 253.7) |
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 #0B4B8B | 8.77:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #0B4B8B | 2.39:1 | Fails | Lc 14.5 | Not readable |
| #0B4B8B text on white | 8.77:1 | AAA | Lc 89.5 | Fine for body text |
| #0B4B8B text on black | 2.39:1 | Fails | Lc -12.7 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF3
oklch(88.5% 0.039 254.3)
-
Step 300
300
#A1C4EE
oklch(80.9% 0.071 253.2)
-
Step 400
400
#6CA4E6
oklch(70.7% 0.114 253.3)
-
Step 500
500
#428BDF
oklch(63% 0.146 253.8)
-
Step 600
600
#1E73CD
oklch(55.5% 0.159 254)
-
Step 700
700
#0E60B1
oklch(49% 0.148 253.8)
-
Step 800
800 (this color)
#0B4B8B
oklch(41.3% 0.122 253.7)
-
Step 900
900
#174272
oklch(37.6% 0.095 253.7)
-
Step 950
950
#0F2743
oklch(27% 0.06 253.9)
#0B4B8B 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) | #28518D | 0.029 |
| Deuteranopia (no green cones) | #0A468A | 0.015 |
| Tritanopia (no blue cones) | #005A64 | 0.090 |
| Achromatopsia (no color) | #4B4B4B | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B4B8B
#0B4B8B
oklch(41.3% 0.122 253.7)
- #674200
#674200
oklch(41.2% 0.088 73.2)
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 #0B4B8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.015
- Light Navy #155084 ΔE 0.021
- Dusk Blue #26538D ΔE 0.032
- Deep Sea Blue #015482 ΔE 0.033
- Twilight Blue #0A437A ΔE 0.035
- Light Navy Blue #2E5A88 ΔE 0.056
- Blueberry #464196 ΔE 0.065
- Denim Blue #3B5B92 ΔE 0.067
Use #0B4B8B 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.