#313B6B
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.083 272.8), rgb(49, 59, 107).
Aa
White text reads best on this color (10.66:1).
About this color
#313B6B is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.083 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.043 away. White text reads best on it, at 10.66:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.66:1 |
Values
| HEX | #313B6B |
| RGB | rgb(49, 59, 107) |
| HSL | hsl(230, 37%, 31%) |
| OKLCH | oklch(36.9% 0.083 272.8) |
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 #313B6B | 10.66:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #313B6B | 1.96:1 | Fails | Lc 9.3 | Not readable |
| #313B6B text on white | 10.66:1 | AAA | Lc 94.6 | Preferred for body text |
| #313B6B text on black | 1.96:1 | Fails | Lc -8.0 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D1D8F1
oklch(88.5% 0.035 273.2)
-
Step 300
300
#B3BFEA
oklch(81% 0.062 272.7)
-
Step 400
400
#8C9CDF
oklch(70.6% 0.1 273.3)
-
Step 500
500
#7083D6
oklch(63.2% 0.127 272.6)
-
Step 600
600
#596BC4
oklch(55.7% 0.139 272.5)
-
Step 700
700
#4958A9
oklch(49% 0.13 272.8)
-
Step 800
800
#3C4989
oklch(42.8% 0.107 272.5)
-
Step 900
900 (this color)
#313B6B
oklch(36.9% 0.083 272.8)
-
Step 950
950
#1E2440
oklch(27% 0.053 273.2)
#313B6B 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) | #27416D | 0.020 |
| Deuteranopia (no green cones) | #213C6A | 0.020 |
| Tritanopia (no blue cones) | #18454D | 0.074 |
| Achromatopsia (no color) | #3E3E3E | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313B6B
#313B6B
oklch(36.9% 0.083 272.8)
- #4D3E00
#4D3E00
oklch(36.9% 0.076 93.4)
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 #313B6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.043
- Marine Blue #01386A ΔE 0.047
- Prussian Blue #1D3557 ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.050
- Dark Blue Grey #1F3B4D ΔE 0.060
- Charcoal #264653 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.066
- Cobalt #1E488F ΔE 0.067
Use #313B6B 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.