#31386B
Closest named color: Marine Blue (#01386A). oklch(36.2% 0.088 275.2), rgb(49, 56, 107).
Aa
White text reads best on this color (11.00:1).
About this color
#31386B is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.088 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.046 away. White text reads best on it, at 11.00:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.90:1 |
| White text | 11.00:1 |
Values
| HEX | #31386B |
| RGB | rgb(49, 56, 107) |
| HSL | hsl(233, 37%, 31%) |
| OKLCH | oklch(36.2% 0.088 275.2) |
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 #31386B | 11.00:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #31386B | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #31386B text on white | 11.00:1 | AAA | Lc 95.3 | Preferred for body text |
| #31386B text on black | 1.90:1 | Fails | Lc -7.3 | 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
#D2D8F2
oklch(88.6% 0.036 275.3)
-
Step 300
300
#B4BEEC
oklch(80.9% 0.066 275.3)
-
Step 400
400
#8E9BE2
oklch(70.7% 0.105 275.4)
-
Step 500
500
#7381DA
oklch(63.2% 0.134 275.1)
-
Step 600
600
#5C68C7
oklch(55.5% 0.146 275.2)
-
Step 700
700
#4C56AC
oklch(49% 0.136 275.2)
-
Step 800
800
#3E478C
oklch(42.7% 0.113 274.9)
-
Step 900
900 (this color)
#31386B
oklch(36.2% 0.088 275.2)
-
Step 950
950
#1F2441
oklch(27.1% 0.054 274.8)
#31386B 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) | #223F6D | 0.026 |
| Deuteranopia (no green cones) | #1C3A6A | 0.026 |
| Tritanopia (no blue cones) | #18434C | 0.078 |
| Achromatopsia (no color) | #3C3C3C | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31386B
#31386B
oklch(36.2% 0.088 275.2)
- #4A3D00
#4A3D00
oklch(36.3% 0.075 95.4)
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 #31386B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.046
- Twilight Blue #0A437A ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.057
- Dark Blue Grey #1F3B4D ΔE 0.062
- Marine #042E60 ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.067
- Charcoal #264653 ΔE 0.069
Use #31386B 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.