#31356E
Closest named color: Marine Blue (#01386A). oklch(35.7% 0.097 277.3), rgb(49, 53, 110).
Aa
White text reads best on this color (11.26:1).
About this color
#31356E is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.097 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.047 away. White text reads best on it, at 11.26:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.86:1 |
| White text | 11.26:1 |
Values
| HEX | #31356E |
| RGB | rgb(49, 53, 110) |
| HSL | hsl(236, 38%, 31%) |
| OKLCH | oklch(35.7% 0.097 277.3) |
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 #31356E | 11.26:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #31356E | 1.86:1 | Fails | Lc 8.1 | Not readable |
| #31356E text on white | 11.26:1 | AAA | Lc 95.8 | Preferred for body text |
| #31356E 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
#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
#B4BDF0
oklch(80.9% 0.073 276.8)
-
Step 400
400
#8F99E9
oklch(70.7% 0.117 277.5)
-
Step 500
500
#757EE2
oklch(63.2% 0.149 277.4)
-
Step 600
600
#5F65CF
oklch(55.6% 0.161 277.4)
-
Step 700
700
#4E53B4
oklch(49.1% 0.151 277.1)
-
Step 800
800
#404491
oklch(42.6% 0.125 277.5)
-
Step 900
900 (this color)
#31356E
oklch(35.7% 0.097 277.3)
-
Step 950
950
#1F2344
oklch(27.1% 0.061 276.3)
#31356E 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) | #1A3D70 | 0.033 |
| Deuteranopia (no green cones) | #13386D | 0.035 |
| Tritanopia (no blue cones) | #16424C | 0.086 |
| Achromatopsia (no color) | #3B3B3B | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31356E
#31356E
oklch(35.7% 0.097 277.3)
- #473C00
#473C00
oklch(35.7% 0.074 97.5)
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 #31356E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.047
- Prussian Blue #1D3557 ΔE 0.050
- Twilight Blue #0A437A ΔE 0.051
- Marine #042E60 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.066
- Dark Grey Blue #29465B ΔE 0.068
- Dark Blue Grey #1F3B4D ΔE 0.070
- Cobalt #1E488F ΔE 0.072
Use #31356E 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.