#313A6C
Closest named color: Twilight Blue (#0A437A). oklch(36.7% 0.086 273.7), rgb(49, 58, 108).
Aa
White text reads best on this color (10.75:1).
About this color
#313A6C is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.086 and its hue 274°. 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 10.75:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.75:1 |
Values
| HEX | #313A6C |
| RGB | rgb(49, 58, 108) |
| HSL | hsl(231, 38%, 31%) |
| OKLCH | oklch(36.7% 0.086 273.7) |
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 #313A6C | 10.75:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #313A6C | 1.95:1 | Fails | Lc 9.1 | Not readable |
| #313A6C text on white | 10.75:1 | AAA | Lc 94.8 | Preferred for body text |
| #313A6C text on black | 1.95:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D1D8F2
oklch(88.5% 0.037 273.7)
-
Step 300
300
#B3BEEB
oklch(80.8% 0.065 274.1)
-
Step 400
400
#8C9CE1
oklch(70.7% 0.103 273.5)
-
Step 500
500
#7182D9
oklch(63.2% 0.132 273.7)
-
Step 600
600
#5A69C6
oklch(55.5% 0.144 273.9)
-
Step 700
700
#4A57AB
oklch(49% 0.134 273.8)
-
Step 800
800
#3D488B
oklch(42.8% 0.111 273.8)
-
Step 900
900 (this color)
#313A6C
oklch(36.7% 0.086 273.7)
-
Step 950
950
#1E2441
oklch(27% 0.055 273.4)
#313A6C 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) | #25406E | 0.021 |
| Deuteranopia (no green cones) | #1F3B6B | 0.023 |
| Tritanopia (no blue cones) | #17454D | 0.078 |
| Achromatopsia (no color) | #3E3E3E | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313A6C
#313A6C
oklch(36.7% 0.086 273.7)
- #4C3E00
#4C3E00
oklch(36.8% 0.075 94.5)
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 #313A6C, 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 0.049
- Dark Grey Blue #29465B ΔE 0.054
- Dark Blue Grey #1F3B4D ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.065
- Charcoal #264653 ΔE 0.066
- Cobalt #1E488F ΔE 0.067
Use #313A6C 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.