#31357D
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.12 276.4), rgb(49, 53, 125).
Aa
White text reads best on this color (10.84:1).
About this color
#31357D is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.120 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.050 away. White text reads best on it, at 10.84:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.93:1 |
| White text | 10.84:1 |
Values
| HEX | #31357D |
| RGB | rgb(49, 53, 125) |
| HSL | hsl(237, 44%, 34%) |
| OKLCH | oklch(36.9% 0.12 276.4) |
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 #31357D | 10.84:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #31357D | 1.93:1 | Fails | Lc 9.1 | Not readable |
| #31357D text on white | 10.84:1 | AAA | Lc 94.8 | Preferred for body text |
| #31357D text on black | 1.93:1 | Fails | Lc -7.8 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#D0D7FB
oklch(88.5% 0.05 276.6)
-
Step 300
300
#B1BCFB
oklch(80.9% 0.09 276.5)
-
Step 400
400
#8A97F9
oklch(70.8% 0.143 276.4)
-
Step 500
500
#6F79F6
oklch(63.1% 0.184 276.3)
-
Step 600
600
#5A5EE5
oklch(55.6% 0.2 276.4)
-
Step 700
700
#4A4CC7
oklch(49% 0.187 276.3)
-
Step 800
800
#3D40A1
oklch(42.8% 0.154 276.4)
-
Step 900
900 (this color)
#31357D
oklch(36.9% 0.12 276.4)
-
Step 950
950
#1E214B
oklch(27.1% 0.077 276.9)
#31357D 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) | #00407F | 0.046 |
| Deuteranopia (no green cones) | #003A7C | 0.044 |
| Tritanopia (no blue cones) | #004653 | 0.105 |
| Achromatopsia (no color) | #3D3D3D | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31357D
#31357D
oklch(36.9% 0.12 276.4)
- #4B3F00
#4B3F00
oklch(36.9% 0.076 96.9)
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 #31357D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.050
- Cobalt #1E488F ΔE 0.057
- Marine Blue #01386A ΔE 0.058
- Blueberry #464196 ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.073
- Marine #042E60 ΔE 0.076
- Light Navy #155084 ΔE 0.076
Use #31357D 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.