#30366B
Closest named color: Marine Blue (#01386A). oklch(35.7% 0.091 275.9), rgb(48, 54, 107).
Aa
White text reads best on this color (11.25:1).
About this color
#30366B is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.091 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.044 away. White text reads best on it, at 11.25:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.86:1 |
| White text | 11.25:1 |
Values
| HEX | #30366B |
| RGB | rgb(48, 54, 107) |
| HSL | hsl(234, 38%, 30%) |
| OKLCH | oklch(35.7% 0.091 275.9) |
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 #30366B | 11.25:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #30366B | 1.86:1 | Fails | Lc 8.1 | Not readable |
| #30366B text on white | 11.25:1 | AAA | Lc 95.8 | Preferred for body text |
| #30366B text on black | 1.86:1 | 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
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D2D8F3
oklch(88.6% 0.038 275.7)
-
Step 300
300
#B4BEED
oklch(81% 0.067 275.4)
-
Step 400
400
#8E9AE4
oklch(70.6% 0.109 276.2)
-
Step 500
500
#7380DD
oklch(63.2% 0.14 275.6)
-
Step 600
600
#5D67CA
oklch(55.6% 0.152 276)
-
Step 700
700
#4D55AF
oklch(49.1% 0.141 276)
-
Step 800
800
#3F468E
oklch(42.7% 0.118 276)
-
Step 900
900 (this color)
#30366B
oklch(35.7% 0.091 275.9)
-
Step 950
950
#1F2342
oklch(26.9% 0.058 276.3)
#30366B 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) | #1E3D6D | 0.028 |
| Deuteranopia (no green cones) | #18386A | 0.029 |
| Tritanopia (no blue cones) | #16424B | 0.081 |
| Achromatopsia (no color) | #3B3B3B | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #30366B
#30366B
oklch(35.7% 0.091 275.9)
- #483B00
#483B00
oklch(35.6% 0.073 95)
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 #30366B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.045
- Twilight Blue #0A437A ΔE 0.050
- Marine #042E60 ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.070
- Charcoal #264653 ΔE 0.074
Use #30366B 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.