#5B3666
Closest named color: Dark Slate Blue (#483D8B). oklch(39.8% 0.09 318.2), rgb(91, 54, 102).
Aa
White text reads best on this color (9.70:1).
About this color
#5B3666 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.090 and its hue 318°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.070 away. White text reads best on it, at 9.70:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.090) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.16:1 |
| White text | 9.70:1 |
Values
| HEX | #5B3666 |
| RGB | rgb(91, 54, 102) |
| HSL | hsl(286, 31%, 31%) |
| OKLCH | oklch(39.8% 0.09 318.2) |
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 #5B3666 | 9.70:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #5B3666 | 2.16:1 | Fails | Lc 11.7 | Not readable |
| #5B3666 text on white | 9.70:1 | AAA | Lc 92.3 | Preferred for body text |
| #5B3666 text on black | 2.16:1 | Fails | Lc -10.1 | 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
#F8F4F9
oklch(97.2% 0.008 319.4)
-
Step 100
100
#EFE6F2
oklch(93.5% 0.019 317.7)
-
Step 200
200
#E4D2E9
oklch(88.5% 0.037 318.9)
-
Step 300
300
#D3B3DD
oklch(80.8% 0.068 318.1)
-
Step 400
400
#BD8BCC
oklch(70.8% 0.107 318.3)
-
Step 500
500
#AC6CBF
oklch(63.1% 0.138 318.2)
-
Step 600
600
#9752AB
oklch(55.6% 0.15 318.2)
-
Step 700
700
#814293
oklch(49.1% 0.14 318.3)
-
Step 800
800
#693777
oklch(42.7% 0.116 318.5)
-
Step 900
900 (this color)
#5B3666
oklch(39.8% 0.09 318.2)
-
Step 950
950
#321D38
oklch(27.1% 0.056 318.5)
#5B3666 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) | #2E4268 | 0.079 |
| Deuteranopia (no green cones) | #384665 | 0.072 |
| Tritanopia (no blue cones) | #5B3C49 | 0.057 |
| Achromatopsia (no color) | #444444 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B3666
#5B3666
oklch(39.8% 0.09 318.2)
- #2D521F
#2D521F
oklch(39.8% 0.09 138)
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 #5B3666, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.070
- Purple Brown #673A3F ΔE 0.075
- Grape Purple #5D1451 ΔE 0.075
- Brownish Purple #76424E ΔE 0.082
- Dusk #4E5481 ΔE 0.086
- Twilight #4E518B ΔE 0.086
- Blueberry #464196 ΔE 0.088
- Rebecca Purple #663399 ΔE 0.088
Use #5B3666 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.