#0B305C
Closest named color: Marine (#042E60). oklch(31.1% 0.089 255.4), rgb(11, 48, 92).
Aa
White text reads best on this color (13.19:1).
About this color
#0B305C is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.089 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.011 away. White text reads best on it, at 13.19:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.59:1 |
| White text | 13.19:1 |
Values
| HEX | #0B305C |
| RGB | rgb(11, 48, 92) |
| HSL | hsl(213, 79%, 20%) |
| OKLCH | oklch(31.1% 0.089 255.4) |
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 #0B305C | 13.19:1 | AAA | Lc -102.5 | Preferred for body text |
| Black text on #0B305C | 1.59:1 | Fails | Lc 0.0 | Not readable |
| #0B305C text on white | 13.19:1 | AAA | Lc 99.2 | Preferred for body text |
| #0B305C text on black | 1.59:1 | 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
#EFF6FF
oklch(97% 0.014 254.6)
-
Step 100
100
#DDEBFF
oklch(93.6% 0.031 257.2)
-
Step 200
200
#C1DCFF
oklch(88.6% 0.056 255)
-
Step 300
300
#96C4FF
oklch(81% 0.097 254.9)
-
Step 400
400
#59A2FF
oklch(70.7% 0.155 255.4)
-
Step 500
500
#1787FF
oklch(63.2% 0.201 255.3)
-
Step 600
600
#0070DC
oklch(55.6% 0.186 255.4)
-
Step 700
700
#005EBB
oklch(49.1% 0.165 255.5)
-
Step 800
800
#004D9A
oklch(42.7% 0.142 255.2)
-
Step 900
900
#004082
oklch(37.8% 0.125 255.2)
-
Step 950
950 (this color)
#0B305C
oklch(31.1% 0.089 255.4)
#0B305C 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) | #19345E | 0.019 |
| Deuteranopia (no green cones) | #072D5B | 0.010 |
| Tritanopia (no blue cones) | #003B41 | 0.068 |
| Achromatopsia (no color) | #303030 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B305C
#0B305C
oklch(31.1% 0.089 255.4)
- #432B00
#432B00
oklch(31.1% 0.065 76)
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 #0B305C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.011
- Prussian Blue #1D3557 ΔE 0.027
- Marine Blue #01386A ΔE 0.032
- Midnight Green #073B4C ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.054
- Space Cadet #2B2D42 ΔE 0.057
- Gunmetal #293241 ΔE 0.059
- Oxford Blue #1B263B ΔE 0.063
Use #0B305C 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.