#3B337E
Closest named color: Dark Slate Blue (#483D8B). oklch(37.4% 0.122 283.6), rgb(59, 51, 126).
Aa
White text reads best on this color (10.71:1).
About this color
#3B337E is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.122 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.041 away. White text reads best on it, at 10.71:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.96:1 |
| White text | 10.71:1 |
Values
| HEX | #3B337E |
| RGB | rgb(59, 51, 126) |
| HSL | hsl(246, 42%, 35%) |
| OKLCH | oklch(37.4% 0.122 283.6) |
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 #3B337E | 10.71:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #3B337E | 1.96:1 | Fails | Lc 9.4 | Not readable |
| #3B337E text on white | 10.71:1 | AAA | Lc 94.5 | Preferred for body text |
| #3B337E 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
#F4F5FE
oklch(97.2% 0.012 281.1)
-
Step 100
100
#E7E8FC
oklch(93.6% 0.027 283.6)
-
Step 200
200
#D4D5FB
oklch(88.4% 0.052 284.1)
-
Step 300
300
#B8B9FA
oklch(80.8% 0.091 283.5)
-
Step 400
400
#9692F8
oklch(70.7% 0.147 283.8)
-
Step 500
500
#7F73F5
oklch(63.1% 0.188 283.8)
-
Step 600
600
#6A57E4
oklch(55.6% 0.205 283.6)
-
Step 700
700
#5946C6
oklch(49.1% 0.19 283.7)
-
Step 800
800
#483BA0
oklch(42.7% 0.157 283.4)
-
Step 900
900 (this color)
#3B337E
oklch(37.4% 0.122 283.6)
-
Step 950
950
#231F4A
oklch(27% 0.077 284.2)
#3B337E 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) | #004081 | 0.061 |
| Deuteranopia (no green cones) | #003B7C | 0.060 |
| Tritanopia (no blue cones) | #214453 | 0.103 |
| Achromatopsia (no color) | #3E3E3E | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B337E
#3B337E
oklch(37.4% 0.122 283.6)
- #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 #3B337E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.041
- Blueberry #464196 ΔE 0.056
- Twilight Blue #0A437A ΔE 0.063
- Cobalt #1E488F ΔE 0.065
- Marine Blue #01386A ΔE 0.072
- Indigo #4B0082 ΔE 0.081
- Sapphire #2138AB ΔE 0.082
- Prussian Blue #1D3557 ΔE 0.083
Use #3B337E 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.