#312D7B
Closest named color: Marine Blue (#01386A). oklch(35.2% 0.128 279.8), rgb(49, 45, 123).
Aa
White text reads best on this color (11.71:1).
About this color
#312D7B is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.128 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.062 away. White text reads best on it, at 11.71:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.79:1 |
| White text | 11.71:1 |
Values
| HEX | #312D7B |
| RGB | rgb(49, 45, 123) |
| HSL | hsl(243, 46%, 33%) |
| OKLCH | oklch(35.2% 0.128 279.8) |
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 #312D7B | 11.71:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #312D7B | 1.79:1 | Fails | Lc 7.4 | Not readable |
| #312D7B text on white | 11.71:1 | AAA | Lc 96.5 | Preferred for body text |
| #312D7B text on black | 1.79:1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E6E8FD
oklch(93.6% 0.028 281.5)
-
Step 200
200
#D1D6FD
oklch(88.5% 0.054 279.5)
-
Step 300
300
#B4BAFE
oklch(80.9% 0.096 280.1)
-
Step 400
400
#8F93FE
oklch(70.7% 0.155 280)
-
Step 500
500
#7674FC
oklch(63.1% 0.197 279.8)
-
Step 600
600
#6258EB
oklch(55.7% 0.214 279.9)
-
Step 700
700
#5146CC
oklch(49% 0.199 279.8)
-
Step 800
800
#423BA5
oklch(42.7% 0.165 279.8)
-
Step 900
900 (this color)
#312D7B
oklch(35.2% 0.128 279.8)
-
Step 950
950
#201F4D
oklch(26.9% 0.083 280.3)
#312D7B 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) | #003B7E | 0.053 |
| Deuteranopia (no green cones) | #003579 | 0.049 |
| Tritanopia (no blue cones) | #04404F | 0.111 |
| Achromatopsia (no color) | #383838 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #312D7B
#312D7B
oklch(35.2% 0.128 279.8)
- #443B00
#443B00
oklch(35.1% 0.073 99.7)
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 #312D7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.064
- Twilight Blue #0A437A ΔE 0.065
- Midnight Blue #191970 ΔE 0.067
- Marine #042E60 ΔE 0.071
- Prussian Blue #1D3557 ΔE 0.075
- Cobalt #1E488F ΔE 0.076
- Blueberry #464196 ΔE 0.077
Use #312D7B 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.