#30366D
Closest named color: Marine Blue (#01386A). oklch(35.8% 0.094 275.9), rgb(48, 54, 109).
Aa
White text reads best on this color (11.20:1).
About this color
#30366D is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.094 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.045 away. White text reads best on it, at 11.20:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.87:1 |
| White text | 11.20:1 |
Values
| HEX | #30366D |
| RGB | rgb(48, 54, 109) |
| HSL | hsl(234, 39%, 31%) |
| OKLCH | oklch(35.8% 0.094 275.9) |
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 #30366D | 11.20:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #30366D | 1.87:1 | Fails | Lc 8.2 | Not readable |
| #30366D text on white | 11.20:1 | AAA | Lc 95.7 | Preferred for body text |
| #30366D text on black | 1.87:1 | 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 900.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D1D8F4
oklch(88.6% 0.039 274.4)
-
Step 300
300
#B4BDEF
oklch(80.9% 0.071 276.7)
-
Step 400
400
#8D9AE7
oklch(70.7% 0.114 275.8)
-
Step 500
500
#737FDF
oklch(63.1% 0.144 276.1)
-
Step 600
600
#5C66CD
oklch(55.5% 0.157 275.8)
-
Step 700
700
#4C54B2
oklch(49% 0.147 275.9)
-
Step 800
800
#3E4690
oklch(42.8% 0.121 275.4)
-
Step 900
900 (this color)
#30366D
oklch(35.8% 0.094 275.9)
-
Step 950
950
#1F2343
oklch(27% 0.059 276.3)
#30366D 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) | #1D3E6F | 0.030 |
| Deuteranopia (no green cones) | #15396C | 0.032 |
| Tritanopia (no blue cones) | #14424C | 0.083 |
| Achromatopsia (no color) | #3B3B3B | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #30366D
#30366D
oklch(35.8% 0.094 275.9)
- #483C00
#483C00
oklch(35.8% 0.074 96.4)
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 #30366D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.045
- Prussian Blue #1D3557 ΔE 0.048
- Twilight Blue #0A437A ΔE 0.049
- Marine #042E60 ΔE 0.061
- Dark Grey Blue #29465B ΔE 0.064
- Dark Blue Grey #1F3B4D ΔE 0.067
- Dark Slate Blue #483D8B ΔE 0.067
- Cobalt #1E488F ΔE 0.071
Use #30366D 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.