#0B305B
Closest named color: Marine (#042E60). oklch(31% 0.087 255), rgb(11, 48, 91).
Aa
White text reads best on this color (13.22:1).
About this color
#0B305B is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.087 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.013 away. White text reads best on it, at 13.22:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.58:1 |
| White text | 13.22:1 |
Values
| HEX | #0B305B |
| RGB | rgb(11, 48, 91) |
| HSL | hsl(212, 78%, 20%) |
| OKLCH | oklch(31% 0.087 255) |
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 #0B305B | 13.22:1 | AAA | Lc -102.5 | Preferred for body text |
| Black text on #0B305B | 1.58:1 | Fails | Lc 0.0 | Not readable |
| #0B305B text on white | 13.22:1 | AAA | Lc 99.2 | Preferred for body text |
| #0B305B text on black | 1.58:1 | 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
#DDEBFE
oklch(93.5% 0.03 256)
-
Step 200
200
#C0DCFF
oklch(88.5% 0.057 254.1)
-
Step 300
300
#96C4FF
oklch(81% 0.097 254.9)
-
Step 400
400
#58A2FF
oklch(70.7% 0.156 255.2)
-
Step 500
500
#1187FF
oklch(63.1% 0.202 255)
-
Step 600
600
#0071DB
oklch(55.7% 0.183 255)
-
Step 700
700
#005EB9
oklch(49% 0.162 255.1)
-
Step 800
800
#004D99
oklch(42.7% 0.14 255)
-
Step 900
900
#004081
oklch(37.7% 0.124 254.9)
-
Step 950
950 (this color)
#0B305B
oklch(31% 0.087 255)
#0B305B 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) | #1A345D | 0.020 |
| Deuteranopia (no green cones) | #092D5A | 0.010 |
| Tritanopia (no blue cones) | #003A41 | 0.065 |
| Achromatopsia (no color) | #303030 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B305B
#0B305B
oklch(31% 0.087 255)
- #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 #0B305B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.013
- Prussian Blue #1D3557 ΔE 0.027
- Marine Blue #01386A ΔE 0.033
- Midnight Green #073B4C ΔE 0.050
- Dark Blue Grey #1F3B4D ΔE 0.053
- Space Cadet #2B2D42 ΔE 0.055
- Gunmetal #293241 ΔE 0.058
- Oxford Blue #1B263B ΔE 0.061
Use #0B305B 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.