#313581
Closest named color: Dark Slate Blue (#483D8B). oklch(37.2% 0.126 276.1), rgb(49, 53, 129).
Aa
White text reads best on this color (10.73:1).
About this color
#313581 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.126 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.047 away. White text reads best on it, at 10.73:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.95:1 |
| White text | 10.73:1 |
Values
| HEX | #313581 |
| RGB | rgb(49, 53, 129) |
| HSL | hsl(237, 45%, 35%) |
| OKLCH | oklch(37.2% 0.126 276.1) |
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 #313581 | 10.73:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #313581 | 1.95:1 | Fails | Lc 9.4 | Not readable |
| #313581 text on white | 10.73:1 | AAA | Lc 94.5 | Preferred for body text |
| #313581 text on black | 1.95:1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CFD7FC
oklch(88.5% 0.052 275.7)
-
Step 300
300
#B0BCFE
oklch(81% 0.094 276.1)
-
Step 400
400
#8896FD
oklch(70.7% 0.151 276)
-
Step 500
500
#6E78FB
oklch(63.2% 0.192 276.1)
-
Step 600
600
#595CEA
oklch(55.6% 0.209 276.3)
-
Step 700
700
#494ACC
oklch(49.1% 0.196 276.1)
-
Step 800
800
#3C3EA5
oklch(42.7% 0.162 276.2)
-
Step 900
900 (this color)
#313581
oklch(37.2% 0.126 276.1)
-
Step 950
950
#1D214C
oklch(27.1% 0.078 275.8)
#313581 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) | #004184 | 0.047 |
| Deuteranopia (no green cones) | #003A7F | 0.044 |
| Tritanopia (no blue cones) | #004755 | 0.109 |
| Achromatopsia (no color) | #3E3E3E | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313581
#313581
oklch(37.2% 0.126 276.1)
- #4C4000
#4C4000
oklch(37.3% 0.077 97.1)
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 #313581, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.047
- Twilight Blue #0A437A ΔE 0.051
- Cobalt #1E488F ΔE 0.055
- Blueberry #464196 ΔE 0.058
- Marine Blue #01386A ΔE 0.062
- Sapphire #2138AB ΔE 0.072
- Light Navy #155084 ΔE 0.076
- Prussian Blue #1D3557 ΔE 0.079
Use #313581 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.