#313580
Closest named color: Dark Slate Blue (#483D8B). oklch(37.1% 0.124 276.2), rgb(49, 53, 128).
Aa
White text reads best on this color (10.76:1).
About this color
#313580 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.124 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.048 away. White text reads best on it, at 10.76:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.95:1 |
| White text | 10.76:1 |
Values
| HEX | #313580 |
| RGB | rgb(49, 53, 128) |
| HSL | hsl(237, 45%, 35%) |
| OKLCH | oklch(37.1% 0.124 276.2) |
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 #313580 | 10.76:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #313580 | 1.95:1 | Fails | Lc 9.3 | Not readable |
| #313580 text on white | 10.76:1 | AAA | Lc 94.6 | Preferred for body text |
| #313580 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
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#CFD7FC
oklch(88.5% 0.052 275.7)
-
Step 300
300
#B0BCFD
oklch(80.9% 0.093 276)
-
Step 400
400
#8996FC
oklch(70.7% 0.149 276.4)
-
Step 500
500
#6E78FA
oklch(63.1% 0.191 276.2)
-
Step 600
600
#595CE9
oklch(55.5% 0.208 276.3)
-
Step 700
700
#4A4BCA
oklch(49.1% 0.192 276.4)
-
Step 800
800
#3C3EA4
oklch(42.7% 0.161 276.3)
-
Step 900
900 (this color)
#313580
oklch(37.1% 0.124 276.2)
-
Step 950
950
#1D214C
oklch(27.1% 0.078 275.8)
#313580 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) | #004183 | 0.047 |
| Deuteranopia (no green cones) | #003A7E | 0.044 |
| Tritanopia (no blue cones) | #004755 | 0.107 |
| Achromatopsia (no color) | #3E3E3E | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313580
#313580
oklch(37.1% 0.124 276.2)
- #4C3F00
#4C3F00
oklch(37% 0.076 95.8)
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 #313580, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.048
- Twilight Blue #0A437A ΔE 0.051
- Cobalt #1E488F ΔE 0.055
- Blueberry #464196 ΔE 0.059
- Marine Blue #01386A ΔE 0.061
- Sapphire #2138AB ΔE 0.073
- Light Navy #155084 ΔE 0.076
- Prussian Blue #1D3557 ΔE 0.078
Use #313580 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.