#31396E
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.091 274.5), rgb(49, 57, 110).
Aa
White text reads best on this color (10.81:1).
About this color
#31396E is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.091 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.044 away. White text reads best on it, at 10.81:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.81:1 |
Values
| HEX | #31396E |
| RGB | rgb(49, 57, 110) |
| HSL | hsl(232, 38%, 31%) |
| OKLCH | oklch(36.6% 0.091 274.5) |
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 #31396E | 10.81:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #31396E | 1.94:1 | Fails | Lc 9.0 | Not readable |
| #31396E text on white | 10.81:1 | AAA | Lc 94.9 | Preferred for body text |
| #31396E text on black | 1.94:1 | Fails | Lc -7.7 | 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
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D1D8F3
oklch(88.5% 0.038 274.1)
-
Step 300
300
#B3BEED
oklch(80.9% 0.068 274.5)
-
Step 400
400
#8C9BE5
oklch(70.7% 0.11 274.5)
-
Step 500
500
#7180DD
oklch(63% 0.14 274.7)
-
Step 600
600
#5A68CB
oklch(55.6% 0.152 274.3)
-
Step 700
700
#4B56AF
oklch(49.1% 0.141 274.7)
-
Step 800
800
#3D478E
oklch(42.8% 0.117 274.4)
-
Step 900
900 (this color)
#31396E
oklch(36.6% 0.091 274.5)
-
Step 950
950
#1E2342
oklch(26.8% 0.058 274.9)
#31396E 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) | #224070 | 0.025 |
| Deuteranopia (no green cones) | #1B3B6D | 0.027 |
| Tritanopia (no blue cones) | #15454E | 0.081 |
| Achromatopsia (no color) | #3D3D3D | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31396E
#31396E
oklch(36.6% 0.091 274.5)
- #4B3E00
#4B3E00
oklch(36.7% 0.075 95.6)
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 #31396E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.044
- Marine Blue #01386A ΔE 0.047
- Prussian Blue #1D3557 ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.063
- Cobalt #1E488F ΔE 0.065
- Dark Blue Grey #1F3B4D ΔE 0.066
- Marine #042E60 ΔE 0.067
Use #31396E 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.