#31356B
Closest named color: Marine Blue (#01386A). oklch(35.5% 0.092 277.4), rgb(49, 53, 107).
Aa
White text reads best on this color (11.33:1).
About this color
#31356B is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.092 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 11.33:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.85:1 |
| White text | 11.33:1 |
Values
| HEX | #31356B |
| RGB | rgb(49, 53, 107) |
| HSL | hsl(236, 37%, 31%) |
| OKLCH | oklch(35.5% 0.092 277.4) |
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 #31356B | 11.33:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #31356B | 1.85:1 | Fails | Lc 7.9 | Not readable |
| #31356B text on white | 11.33:1 | AAA | Lc 96.0 | Preferred for body text |
| #31356B text on black | 1.85:1 | 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
#D2D7F3
oklch(88.4% 0.039 277.6)
-
Step 300
300
#B5BDEE
oklch(80.9% 0.07 277.5)
-
Step 400
400
#909AE5
oklch(70.8% 0.11 277.4)
-
Step 500
500
#767FDD
oklch(63.2% 0.14 277.4)
-
Step 600
600
#6066CB
oklch(55.6% 0.154 277.6)
-
Step 700
700
#4F54B0
oklch(49.1% 0.144 277.4)
-
Step 800
800
#41458E
oklch(42.6% 0.119 277.7)
-
Step 900
900 (this color)
#31356B
oklch(35.5% 0.092 277.4)
-
Step 950
950
#202342
oklch(27% 0.057 277.6)
#31356B 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) | #1D3D6D | 0.031 |
| Deuteranopia (no green cones) | #17386A | 0.032 |
| Tritanopia (no blue cones) | #19414B | 0.081 |
| Achromatopsia (no color) | #3A3A3A | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31356B
#31356B
oklch(35.5% 0.092 277.4)
- #473B00
#473B00
oklch(35.4% 0.073 96.2)
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 #31356B, 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 0.052
- Marine #042E60 ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.065
- Dark Blue Grey #1F3B4D ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.074
Use #31356B 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.