#511D8D
Closest named color: Indigo (#4B0082). oklch(37.8% 0.17 298.9), rgb(81, 29, 141).
Aa
White text reads best on this color (10.99:1).
About this color
#511D8D is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.170 and its hue 299°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Indigo (#4B0082), ΔE 0.041 away. White text reads best on it, at 10.99:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.170) |
| Temperature | in between |
| Nearest name | Indigo (#4B0082) |
| Black text | 1.91:1 |
| White text | 10.99:1 |
Values
| HEX | #511D8D |
| RGB | rgb(81, 29, 141) |
| HSL | hsl(268, 66%, 33%) |
| OKLCH | oklch(37.8% 0.17 298.9) |
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 #511D8D | 10.99:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #511D8D | 1.91:1 | Fails | Lc 9.4 | Not readable |
| #511D8D text on white | 10.99:1 | AAA | Lc 94.5 | Preferred for body text |
| #511D8D text on black | 1.91:1 | 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
#F7F3FF
oklch(97.1% 0.016 301.2)
-
Step 100
100
#EDE5FF
oklch(93.6% 0.036 299.7)
-
Step 200
200
#DED0FF
oklch(88.4% 0.066 298.7)
-
Step 300
300
#CAB1FF
oklch(81% 0.111 298.6)
-
Step 400
400
#B183FF
oklch(70.7% 0.179 298.9)
-
Step 500
500
#A05BFF
oklch(63.1% 0.232 298.9)
-
Step 600
600
#901EFD
oklch(55.6% 0.283 298.8)
-
Step 700
700
#7B00DC
oklch(49% 0.263 298.9)
-
Step 800
800
#6411B2
oklch(42.7% 0.218 299)
-
Step 900
900 (this color)
#511D8D
oklch(37.8% 0.17 298.9)
-
Step 950
950
#2F1452
oklch(27% 0.107 299)
#511D8D 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) | #003C90 | 0.110 |
| Deuteranopia (no green cones) | #003B8B | 0.110 |
| Tritanopia (no blue cones) | #423B55 | 0.126 |
| Achromatopsia (no color) | #3C3C3C | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #511D8D
#511D8D
oklch(37.8% 0.17 298.9)
- #3D4800
#3D4800
oklch(37.8% 0.089 119.1)
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 #511D8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo #4B0082 ΔE 0.041
- Imperial Purple #480CA8 ΔE 0.052
- Chrysanthemum #560BAD ΔE 0.054
- Rebecca Purple #663399 ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.066
- Royal Purple #4B006E ΔE 0.067
- Blueberry #464196 ΔE 0.076
- Indigo Blue #3A18B1 ΔE 0.078
Use #511D8D 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.