#5B3171
Closest named color: Dark Slate Blue (#483D8B). oklch(39.6% 0.112 312.7), rgb(91, 49, 113).
Aa
White text reads best on this color (9.89:1).
About this color
#5B3171 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.112 and its hue 313°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.059 away. White text reads best on it, at 9.89:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.112) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.12:1 |
| White text | 9.89:1 |
Values
| HEX | #5B3171 |
| RGB | rgb(91, 49, 113) |
| HSL | hsl(279, 40%, 32%) |
| OKLCH | oklch(39.6% 0.112 312.7) |
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 #5B3171 | 9.89:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #5B3171 | 2.12:1 | Fails | Lc 11.3 | Not readable |
| #5B3171 text on white | 9.89:1 | AAA | Lc 92.6 | Preferred for body text |
| #5B3171 text on black | 2.12:1 | Fails | Lc -9.8 | 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
#F0E5F6
oklch(93.6% 0.025 314)
-
Step 200
200
#E4D1F0
oklch(88.6% 0.047 312.5)
-
Step 300
300
#D4B1E8
oklch(80.9% 0.085 313.1)
-
Step 400
400
#BD86DC
oklch(70.6% 0.135 312.6)
-
Step 500
500
#AD65D3
oklch(63.2% 0.173 312.7)
-
Step 600
600
#9848C0
oklch(55.6% 0.188 312.6)
-
Step 700
700
#8239A5
oklch(49.1% 0.173 312.9)
-
Step 800
800
#693086
oklch(42.6% 0.144 312.4)
-
Step 900
900 (this color)
#5B3171
oklch(39.6% 0.112 312.7)
-
Step 950
950
#321A3F
oklch(26.9% 0.072 312.5)
#5B3171 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) | #204173 | 0.097 |
| Deuteranopia (no green cones) | #2E446F | 0.086 |
| Tritanopia (no blue cones) | #593C4C | 0.077 |
| Achromatopsia (no color) | #434343 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B3171
#5B3171
oklch(39.6% 0.112 312.7)
- #2E5200
#2E5200
oklch(39.6% 0.111 132.4)
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 #5B3171, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.059
- Rebecca Purple #663399 ΔE 0.069
- Grape Purple #5D1451 ΔE 0.074
- Blueberry #464196 ΔE 0.077
- Rich Purple #720058 ΔE 0.086
- Twilight #4E518B ΔE 0.088
- Velvet #750851 ΔE 0.089
- Royal Purple #4B006E ΔE 0.092
Use #5B3171 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.