#0B4C8A
Closest named color: Cobalt (#1E488F). oklch(41.5% 0.12 252.8), rgb(11, 76, 138).
Aa
White text reads best on this color (8.69:1).
About this color
#0B4C8A is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.120 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.018 away. White text reads best on it, at 8.69:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.41:1 |
| White text | 8.69:1 |
Values
| HEX | #0B4C8A |
| RGB | rgb(11, 76, 138) |
| HSL | hsl(209, 85%, 29%) |
| OKLCH | oklch(41.5% 0.12 252.8) |
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 #0B4C8A | 8.69:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #0B4C8A | 2.41:1 | Fails | Lc 14.7 | Not readable |
| #0B4C8A text on white | 8.69:1 | AAA | Lc 89.3 | Fine for body text |
| #0B4C8A text on black | 2.41:1 | Fails | Lc -12.9 | 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
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF3
oklch(88.5% 0.039 254.3)
-
Step 300
300
#A1C4ED
oklch(80.9% 0.069 252.7)
-
Step 400
400
#6CA4E5
oklch(70.7% 0.113 253)
-
Step 500
500
#428CDD
oklch(63.1% 0.143 252.8)
-
Step 600
600
#1D74CB
oklch(55.6% 0.156 253)
-
Step 700
700
#0C61AF
oklch(49.1% 0.144 252.7)
-
Step 800
800 (this color)
#0B4C8A
oklch(41.5% 0.12 252.8)
-
Step 900
900
#174371
oklch(37.8% 0.092 252.4)
-
Step 950
950
#0F2742
oklch(26.9% 0.059 253.1)
#0B4C8A 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) | #2B518C | 0.029 |
| Deuteranopia (no green cones) | #114689 | 0.017 |
| Tritanopia (no blue cones) | #005B64 | 0.088 |
| Achromatopsia (no color) | #4B4B4B | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B4C8A
#0B4C8A
oklch(41.5% 0.12 252.8)
- #684300
#684300
oklch(41.5% 0.088 73.6)
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 #0B4C8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.018
- Light Navy #155084 ΔE 0.018
- Deep Sea Blue #015482 ΔE 0.029
- Dusk Blue #26538D ΔE 0.030
- Twilight Blue #0A437A ΔE 0.036
- Light Navy Blue #2E5A88 ΔE 0.053
- Denim Blue #3B5B92 ΔE 0.064
- Blueberry #464196 ΔE 0.067
Use #0B4C8A 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.