#5B3375
Closest named color: Dark Slate Blue (#483D8B). oklch(40.2% 0.114 310.2), rgb(91, 51, 117).
Aa
White text reads best on this color (9.65:1).
About this color
#5B3375 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.114 and its hue 310°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.053 away. White text reads best on it, at 9.65:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.114) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.17:1 |
| White text | 9.65:1 |
Values
| HEX | #5B3375 |
| RGB | rgb(91, 51, 117) |
| HSL | hsl(276, 39%, 33%) |
| OKLCH | oklch(40.2% 0.114 310.2) |
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 #5B3375 | 9.65:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #5B3375 | 2.17:1 | Fails | Lc 11.9 | Not readable |
| #5B3375 text on white | 9.65:1 | AAA | Lc 92.1 | Preferred for body text |
| #5B3375 text on black | 2.17:1 | Fails | Lc -10.3 | 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
#F8F3FB
oklch(97% 0.012 313.2)
-
Step 100
100
#EFE6F7
oklch(93.7% 0.025 309.4)
-
Step 200
200
#E3D1F1
oklch(88.5% 0.047 310.5)
-
Step 300
300
#D2B2EA
oklch(81% 0.085 310.4)
-
Step 400
400
#BB87E0
oklch(70.8% 0.137 310.1)
-
Step 500
500
#AA66D7
oklch(63.2% 0.174 310.1)
-
Step 600
600
#9549C4
oklch(55.6% 0.19 310.1)
-
Step 700
700
#7F39A9
oklch(49% 0.177 310.2)
-
Step 800
800
#673089
oklch(42.6% 0.147 310.1)
-
Step 900
900 (this color)
#5B3375
oklch(40.2% 0.114 310.2)
-
Step 950
950
#311B40
oklch(27% 0.071 309.9)
#5B3375 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) | #204377 | 0.095 |
| Deuteranopia (no green cones) | #2D4573 | 0.085 |
| Tritanopia (no blue cones) | #583E4F | 0.078 |
| Achromatopsia (no color) | #454545 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B3375
#5B3375
oklch(40.2% 0.114 310.2)
- #335300
#335300
oklch(40.2% 0.109 130.5)
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 #5B3375, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.053
- Rebecca Purple #663399 ΔE 0.062
- Blueberry #464196 ΔE 0.070
- Grape Purple #5D1451 ΔE 0.081
- Twilight #4E518B ΔE 0.082
- Dusk #4E5481 ΔE 0.088
- Rich Purple #720058 ΔE 0.091
- Indigo #4B0082 ΔE 0.093
Use #5B3375 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.