#0B4B9F
Closest named color: Cobalt (#1E488F). oklch(42.9% 0.149 258.1), rgb(11, 75, 159).
Aa
White text reads best on this color (8.32:1).
About this color
#0B4B9F is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.149 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.027 away. White text reads best on it, at 8.32:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.52:1 |
| White text | 8.32:1 |
Values
| HEX | #0B4B9F |
| RGB | rgb(11, 75, 159) |
| HSL | hsl(214, 87%, 33%) |
| OKLCH | oklch(42.9% 0.149 258.1) |
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 #0B4B9F | 8.32:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #0B4B9F | 2.52:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #0B4B9F text on white | 8.32:1 | AAA | Lc 88.1 | Fine for body text |
| #0B4B9F text on black | 2.52:1 | Fails | Lc -14.1 | 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
#9EC3F9
oklch(81% 0.087 257.7)
-
Step 400
400
#68A1F7
oklch(70.7% 0.14 258.4)
-
Step 500
500
#3C87F3
oklch(63.2% 0.178 258)
-
Step 600
600
#146DE2
oklch(55.6% 0.195 258.2)
-
Step 700
700
#035AC4
oklch(49% 0.181 258.2)
-
Step 800
800 (this color)
#0B4B9F
oklch(42.9% 0.149 258.1)
-
Step 900
900
#133F7E
oklch(37.6% 0.117 258.2)
-
Step 950
950
#0D264A
oklch(27.1% 0.074 257.9)
#0B4B9F 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) | #0C55A2 | 0.028 |
| Deuteranopia (no green cones) | #00489D | 0.010 |
| Tritanopia (no blue cones) | #00606D | 0.114 |
| Achromatopsia (no color) | #4E4E4E | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B4B9F
#0B4B9F
oklch(42.9% 0.149 258.1)
- #6A4800
#6A4800
oklch(42.9% 0.089 77.8)
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 #0B4B9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.027
- Dusk Blue #26538D ΔE 0.044
- Light Navy #155084 ΔE 0.049
- Sapphire #2138AB ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.058
- Blueberry #464196 ΔE 0.060
- Twilight Blue #0A437A ΔE 0.064
- Light Navy Blue #2E5A88 ΔE 0.068
Use #0B4B9F 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.