#5B1981
Closest named color: Indigo (#4B0082). oklch(37.7% 0.164 309.3), rgb(91, 25, 129).
Aa
White text reads best on this color (11.04:1).
About this color
#5B1981 is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.164 and its hue 309°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Indigo (#4B0082), ΔE 0.047 away. White text reads best on it, at 11.04:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.164) |
| Temperature | in between |
| Nearest name | Indigo (#4B0082) |
| Black text | 1.90:1 |
| White text | 11.04:1 |
Values
| HEX | #5B1981 |
| RGB | rgb(91, 25, 129) |
| HSL | hsl(278, 68%, 30%) |
| OKLCH | oklch(37.7% 0.164 309.3) |
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 #5B1981 | 11.04:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #5B1981 | 1.90:1 | Fails | Lc 9.4 | Not readable |
| #5B1981 text on white | 11.04:1 | AAA | Lc 94.5 | Preferred for body text |
| #5B1981 text on black | 1.90:1 | 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
#F9F3FE
oklch(97.2% 0.016 310.1)
-
Step 100
100
#F1E4FC
oklch(93.6% 0.035 309.8)
-
Step 200
200
#E6CDFC
oklch(88.4% 0.069 309)
-
Step 300
300
#D8AAFD
oklch(80.9% 0.124 309.2)
-
Step 400
400
#C577FB
oklch(70.7% 0.197 309.5)
-
Step 500
500
#B649F9
oklch(63.1% 0.252 309.2)
-
Step 600
600
#A214E7
oklch(55.6% 0.273 309.3)
-
Step 700
700
#8A00C7
oklch(49.1% 0.249 309.3)
-
Step 800
800
#710AA3
oklch(42.8% 0.211 309.3)
-
Step 900
900 (this color)
#5B1981
oklch(37.7% 0.164 309.3)
-
Step 950
950
#35124C
oklch(27% 0.104 308.6)
#5B1981 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) | #003984 | 0.132 |
| Deuteranopia (no green cones) | #003D7F | 0.135 |
| Tritanopia (no blue cones) | #55334D | 0.112 |
| Achromatopsia (no color) | #3C3C3C | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B1981
#5B1981
oklch(37.7% 0.164 309.3)
- #304B00
#304B00
oklch(37.7% 0.1 129.3)
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 #5B1981, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo #4B0082 ΔE 0.047
- Royal Purple #4B006E ΔE 0.058
- Rebecca Purple #663399 ΔE 0.066
- Chrysanthemum #560BAD ΔE 0.076
- Dark Slate Blue #483D8B ΔE 0.079
- Purple #800080 ΔE 0.079
- Imperial Purple #480CA8 ΔE 0.081
- Grape Purple #5D1451 ΔE 0.083
Use #5B1981 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.