#31316D
Closest named color: Marine Blue (#01386A). oklch(34.8% 0.102 279.7), rgb(49, 49, 109).
Aa
White text reads best on this color (11.72:1).
About this color
#31316D is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.102 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.049 away. White text reads best on it, at 11.72:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.79:1 |
| White text | 11.72:1 |
Values
| HEX | #31316D |
| RGB | rgb(49, 49, 109) |
| HSL | hsl(240, 38%, 31%) |
| OKLCH | oklch(34.8% 0.102 279.7) |
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 #31316D | 11.72:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #31316D | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #31316D text on white | 11.72:1 | AAA | Lc 96.7 | Preferred for body text |
| #31316D 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D3D7F5
oklch(88.5% 0.041 279.5)
-
Step 300
300
#B6BCF2
oklch(80.9% 0.076 279.6)
-
Step 400
400
#9297EB
oklch(70.6% 0.122 280.2)
-
Step 500
500
#787BE5
oklch(63% 0.157 279.7)
-
Step 600
600
#6362D3
oklch(55.7% 0.169 279.8)
-
Step 700
700
#5250B7
oklch(49.1% 0.158 279.7)
-
Step 800
800
#434294
oklch(42.6% 0.131 279.8)
-
Step 900
900 (this color)
#31316D
oklch(34.8% 0.102 279.7)
-
Step 950
950
#212245
oklch(27.1% 0.064 280)
#31316D 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) | #113A6F | 0.041 |
| Deuteranopia (no green cones) | #09366C | 0.044 |
| Tritanopia (no blue cones) | #183E4A | 0.087 |
| Achromatopsia (no color) | #383838 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31316D
#31316D
oklch(34.8% 0.102 279.7)
- #433A00
#433A00
oklch(34.7% 0.072 99.5)
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 #31316D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.049
- Prussian Blue #1D3557 ΔE 0.051
- Marine #042E60 ΔE 0.058
- Twilight Blue #0A437A ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.071
- Dark Blue Grey #1F3B4D ΔE 0.074
- Midnight Blue #191970 ΔE 0.075
- Space Cadet #2B2D42 ΔE 0.077
Use #31316D 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.