#31366D
Closest named color: Marine Blue (#01386A). oklch(35.9% 0.094 276.7), rgb(49, 54, 109).
Aa
White text reads best on this color (11.17:1).
About this color
#31366D is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.094 and its hue 277°. 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 11.17:1.
| 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 | 11.17:1 |
Values
| HEX | #31366D |
| RGB | rgb(49, 54, 109) |
| HSL | hsl(235, 38%, 31%) |
| OKLCH | oklch(35.9% 0.094 276.7) |
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 #31366D | 11.17:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #31366D | 1.87:1 | Fails | Lc 8.2 | Not readable |
| #31366D text on white | 11.17:1 | AAA | Lc 95.7 | Preferred for body text |
| #31366D 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D2D7F4
oklch(88.4% 0.04 277.8)
-
Step 300
300
#B4BDEF
oklch(80.9% 0.071 276.7)
-
Step 400
400
#8E9AE6
oklch(70.7% 0.112 276.3)
-
Step 500
500
#747FDF
oklch(63.1% 0.144 276.5)
-
Step 600
600
#5E66CD
oklch(55.6% 0.157 276.7)
-
Step 700
700
#4E54B1
oklch(49.1% 0.145 276.8)
-
Step 800
800
#40458F
oklch(42.6% 0.12 277.1)
-
Step 900
900 (this color)
#31366D
oklch(35.9% 0.094 276.7)
-
Step 950
950
#1F2343
oklch(27% 0.059 276.3)
#31366D 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 | 0.031 |
| Deuteranopia (no green cones) | #16396C | 0.032 |
| Tritanopia (no blue cones) | #17424C | 0.082 |
| Achromatopsia (no color) | #3B3B3B | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31366D
#31366D
oklch(35.9% 0.094 276.7)
- #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 #31366D, 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 0.049
- Twilight Blue #0A437A ΔE 0.049
- Marine #042E60 ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.066
- Dark Blue Grey #1F3B4D ΔE 0.067
- Cobalt #1E488F ΔE 0.071
Use #31366D 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.