#0B3458
Closest named color: Prussian Blue (#1D3557). oklch(31.8% 0.078 249.6), rgb(11, 52, 88).
Aa
White text reads best on this color (12.75:1).
About this color
#0B3458 is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.078 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.017 away. White text reads best on it, at 12.75:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.64:1 |
| White text | 12.75:1 |
Values
| HEX | #0B3458 |
| RGB | rgb(11, 52, 88) |
| HSL | hsl(208, 78%, 19%) |
| OKLCH | oklch(31.8% 0.078 249.6) |
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 #0B3458 | 12.75:1 | AAA | Lc -101.9 | Preferred for body text |
| Black text on #0B3458 | 1.64:1 | Fails | Lc 0.0 | Not readable |
| #0B3458 text on white | 12.75:1 | AAA | Lc 98.5 | Preferred for body text |
| #0B3458 text on black | 1.64:1 | 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
#4EA6F8
oklch(70.8% 0.147 249.3)
-
Step 500
500
#008DEE
oklch(63.2% 0.176 249.3)
-
Step 600
600
#0076C9
oklch(55.6% 0.155 249.4)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#004377
oklch(37.7% 0.106 249.9)
-
Step 950
950 (this color)
#0B3458
oklch(31.8% 0.078 249.6)
#0B3458 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) | #233659 | 0.025 |
| Deuteranopia (no green cones) | #172F57 | 0.017 |
| Tritanopia (no blue cones) | #003D41 | 0.058 |
| Achromatopsia (no color) | #323232 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B3458
#0B3458
oklch(31.8% 0.078 249.6)
- #482B00
#482B00
oklch(31.8% 0.069 70.3)
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 #0B3458, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.017
- Marine #042E60 ΔE 0.026
- Marine Blue #01386A ΔE 0.032
- Midnight Green #073B4C ΔE 0.036
- Dark Blue Grey #1F3B4D ΔE 0.039
- Gunmetal #293241 ΔE 0.049
- Space Cadet #2B2D42 ΔE 0.051
- Oxford Blue #1B263B ΔE 0.062
Use #0B3458 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.