#313381
Closest named color: Dark Slate Blue (#483D8B). oklch(36.8% 0.129 276.9), rgb(49, 51, 129).
Aa
White text reads best on this color (10.93:1).
About this color
#313381 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.129 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.050 away. White text reads best on it, at 10.93:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.92:1 |
| White text | 10.93:1 |
Values
| HEX | #313381 |
| RGB | rgb(49, 51, 129) |
| HSL | hsl(239, 45%, 35%) |
| OKLCH | oklch(36.8% 0.129 276.9) |
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 #313381 | 10.93:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #313381 | 1.92:1 | Fails | Lc 9.0 | Not readable |
| #313381 text on white | 10.93:1 | AAA | Lc 94.9 | Preferred for body text |
| #313381 text on black | 1.92:1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FD
oklch(93.7% 0.027 276.8)
-
Step 200
200
#CFD7FD
oklch(88.5% 0.053 275.9)
-
Step 300
300
#B0BBFF
oklch(80.8% 0.097 276.9)
-
Step 400
400
#8995FF
oklch(70.7% 0.154 276.8)
-
Step 500
500
#6F76FD
oklch(63% 0.197 276.9)
-
Step 600
600
#5A5AEC
oklch(55.5% 0.214 276.9)
-
Step 700
700
#4B49CE
oklch(49.2% 0.199 276.8)
-
Step 800
800
#3D3DA6
oklch(42.7% 0.164 276.9)
-
Step 900
900 (this color)
#313381
oklch(36.8% 0.129 276.9)
-
Step 950
950
#1E204D
oklch(27% 0.081 277.5)
#313381 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) | #004084 | 0.049 |
| Deuteranopia (no green cones) | #00397F | 0.045 |
| Tritanopia (no blue cones) | #004655 | 0.110 |
| Achromatopsia (no color) | #3D3D3D | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313381
#313381
oklch(36.8% 0.129 276.9)
- #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 #313381, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.050
- Twilight Blue #0A437A ΔE 0.055
- Cobalt #1E488F ΔE 0.059
- Blueberry #464196 ΔE 0.062
- Marine Blue #01386A ΔE 0.063
- Sapphire #2138AB ΔE 0.072
- Marine #042E60 ΔE 0.079
- Prussian Blue #1D3557 ΔE 0.080
Use #313381 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.