#3B3578
Closest named color: Dark Slate Blue (#483D8B). oklch(37.3% 0.111 283.7), rgb(59, 53, 120).
Aa
White text reads best on this color (10.67:1).
About this color
#3B3578 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.111 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.044 away. White text reads best on it, at 10.67:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.96:1 |
| White text | 10.67:1 |
Values
| HEX | #3B3578 |
| RGB | rgb(59, 53, 120) |
| HSL | hsl(245, 39%, 34%) |
| OKLCH | oklch(37.3% 0.111 283.7) |
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 #3B3578 | 10.67:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #3B3578 | 1.96:1 | Fails | Lc 9.4 | Not readable |
| #3B3578 text on white | 10.67:1 | AAA | Lc 94.5 | Preferred for body text |
| #3B3578 text on black | 1.96:1 | Fails | Lc -8.1 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E7E8FA
oklch(93.6% 0.024 283.4)
-
Step 200
200
#D5D6F7
oklch(88.6% 0.045 284.1)
-
Step 300
300
#B9BAF5
oklch(80.9% 0.083 283.6)
-
Step 400
400
#9794F0
oklch(70.7% 0.133 283.9)
-
Step 500
500
#7F77EB
oklch(63.2% 0.169 283.5)
-
Step 600
600
#6A5CD9
oklch(55.6% 0.184 283.7)
-
Step 700
700
#594BBC
oklch(49.1% 0.171 283.8)
-
Step 800
800
#483E98
oklch(42.6% 0.142 283.6)
-
Step 900
900 (this color)
#3B3578
oklch(37.3% 0.111 283.7)
-
Step 950
950
#232047
oklch(27% 0.07 284.1)
#3B3578 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) | #11407A | 0.053 |
| Deuteranopia (no green cones) | #0D3C77 | 0.053 |
| Tritanopia (no blue cones) | #254451 | 0.094 |
| Achromatopsia (no color) | #3E3E3E | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B3578
#3B3578
oklch(37.3% 0.111 283.7)
- #484200
#484200
oklch(37.3% 0.079 103.7)
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 #3B3578, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.044
- Twilight Blue #0A437A ΔE 0.059
- Blueberry #464196 ΔE 0.061
- Cobalt #1E488F ΔE 0.065
- Marine Blue #01386A ΔE 0.067
- Prussian Blue #1D3557 ΔE 0.074
- Light Navy #155084 ΔE 0.080
- Dark Grey Blue #29465B ΔE 0.081
Use #3B3578 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.