#0B3559
Closest named color: Prussian Blue (#1D3557). oklch(32.2% 0.078 249.1), rgb(11, 53, 89).
Aa
White text reads best on this color (12.59:1).
About this color
#0B3559 is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.078 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.016 away. White text reads best on it, at 12.59:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.66:1 |
| White text | 12.59:1 |
Values
| HEX | #0B3559 |
| RGB | rgb(11, 53, 89) |
| HSL | hsl(208, 78%, 20%) |
| OKLCH | oklch(32.2% 0.078 249.1) |
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 #0B3559 | 12.59:1 | AAA | Lc -101.7 | Preferred for body text |
| Black text on #0B3559 | 1.66:1 | Fails | Lc 0.0 | Not readable |
| #0B3559 text on white | 12.59:1 | AAA | Lc 98.2 | Preferred for body text |
| #0B3559 text on black | 1.66:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#EFF6FE
oklch(97% 0.013 251.6)
-
Step 100
100
#DDECFC
oklch(93.7% 0.027 249.9)
-
Step 200
200
#C0DDFA
oklch(88.6% 0.051 248.4)
-
Step 300
300
#92C6FA
oklch(80.9% 0.092 249)
-
Step 400
400
#4CA6F8
oklch(70.7% 0.148 248.9)
-
Step 500
500
#008DED
oklch(63.1% 0.175 249.1)
-
Step 600
600
#0076C8
oklch(55.5% 0.154 249.2)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#004376
oklch(37.6% 0.105 249.5)
-
Step 950
950 (this color)
#0B3559
oklch(32.2% 0.078 249.1)
#0B3559 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) | #24375A | 0.026 |
| Deuteranopia (no green cones) | #183058 | 0.017 |
| Tritanopia (no blue cones) | #003E42 | 0.058 |
| Achromatopsia (no color) | #333333 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B3559
#0B3559
oklch(32.2% 0.078 249.1)
- #4A2B00
#4A2B00
oklch(32.1% 0.07 68.2)
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 #0B3559, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.016
- Marine #042E60 ΔE 0.028
- Marine Blue #01386A ΔE 0.030
- Midnight Green #073B4C ΔE 0.034
- Dark Blue Grey #1F3B4D ΔE 0.038
- Gunmetal #293241 ΔE 0.050
- Space Cadet #2B2D42 ΔE 0.052
- Oxford Blue #1B263B ΔE 0.065
Use #0B3559 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.