#5B1B71
Closest named color: Royal Purple (#4B006E). oklch(36.6% 0.146 315.9), rgb(91, 27, 113).
Aa
White text reads best on this color (11.41:1).
About this color
#5B1B71 is a dark, vivid purple. In OKLCH its lightness is 37%, its chroma 0.146 and its hue 316°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Royal Purple (#4B006E), ΔE 0.052 away. White text reads best on it, at 11.41:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | vivid (0.146) |
| Temperature | in between |
| Nearest name | Royal Purple (#4B006E) |
| Black text | 1.84:1 |
| White text | 11.41:1 |
Values
| HEX | #5B1B71 |
| RGB | rgb(91, 27, 113) |
| HSL | hsl(285, 61%, 27%) |
| OKLCH | oklch(36.6% 0.146 315.9) |
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 #5B1B71 | 11.41:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #5B1B71 | 1.84:1 | Fails | Lc 8.5 | Not readable |
| #5B1B71 text on white | 11.41:1 | AAA | Lc 95.4 | Preferred for body text |
| #5B1B71 text on black | 1.84:1 | Fails | Lc 0.0 | 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
#F9F3FC
oklch(97.1% 0.013 314.8)
-
Step 100
100
#F2E4F9
oklch(93.6% 0.032 314.7)
-
Step 200
200
#E9CEF5
oklch(88.6% 0.06 315.5)
-
Step 300
300
#DCABF1
oklch(80.9% 0.109 315.5)
-
Step 400
400
#CA7AE9
oklch(70.7% 0.175 315.9)
-
Step 500
500
#BC50E2
oklch(63.1% 0.224 316.1)
-
Step 600
600
#A729D0
oklch(55.6% 0.243 315.8)
-
Step 700
700
#8F17B4
oklch(49.1% 0.226 315.8)
-
Step 800
800
#741992
oklch(42.7% 0.188 315.6)
-
Step 900
900 (this color)
#5B1B71
oklch(36.6% 0.146 315.9)
-
Step 950
950
#371444
oklch(27% 0.092 315.7)
#5B1B71 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) | #003673 | 0.136 |
| Deuteranopia (no green cones) | #1A3C6F | 0.124 |
| Tritanopia (no blue cones) | #592D44 | 0.094 |
| Achromatopsia (no color) | #3A3A3A | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B1B71
#5B1B71
oklch(36.6% 0.146 315.9)
- #214B00
#214B00
oklch(36.8% 0.109 135.9)
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 #5B1B71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Purple #4B006E ΔE 0.052
- Grape Purple #5D1451 ΔE 0.056
- Indigo #4B0082 ΔE 0.059
- Rich Purple #720058 ΔE 0.069
- Plum Purple #4E0550 ΔE 0.070
- Velvet #750851 ΔE 0.081
- Purple #800080 ΔE 0.081
- Rebecca Purple #663399 ΔE 0.082
Use #5B1B71 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.