#57128E
Closest named color: Indigo (#4B0082). oklch(37.7% 0.182 303), rgb(87, 18, 142).
Aa
White text reads best on this color (11.15:1).
About this color
#57128E is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.182 and its hue 303°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Indigo (#4B0082), ΔE 0.039 away. White text reads best on it, at 11.15:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.182) |
| Temperature | in between |
| Nearest name | Indigo (#4B0082) |
| Black text | 1.88:1 |
| White text | 11.15:1 |
Values
| HEX | #57128E |
| RGB | rgb(87, 18, 142) |
| HSL | hsl(273, 78%, 31%) |
| OKLCH | oklch(37.7% 0.182 303) |
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 #57128E | 11.15:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #57128E | 1.88:1 | Fails | Lc 9.5 | Not readable |
| #57128E text on white | 11.15:1 | AAA | Lc 94.4 | Preferred for body text |
| #57128E text on black | 1.88:1 | Fails | Lc -8.2 | 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
#EFE4FF
oklch(93.6% 0.038 304.1)
-
Step 200
200
#E2CFFF
oklch(88.5% 0.068 303.1)
-
Step 300
300
#D0AEFF
oklch(80.9% 0.117 303.1)
-
Step 400
400
#B97EFF
oklch(70.7% 0.188 303)
-
Step 500
500
#A953FF
oklch(63.1% 0.243 302.9)
-
Step 600
600
#9A00FA
oklch(55.6% 0.292 303.2)
-
Step 700
700
#8100D4
oklch(49% 0.258 302.9)
-
Step 800
800
#6A00B0
oklch(42.7% 0.224 302.8)
-
Step 900
900 (this color)
#57128E
oklch(37.7% 0.182 303)
-
Step 950
950
#330F53
oklch(27% 0.115 303.4)
#57128E 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) | #003A91 | 0.126 |
| Deuteranopia (no green cones) | #003B8C | 0.127 |
| Tritanopia (no blue cones) | #4B3753 | 0.131 |
| Achromatopsia (no color) | #3B3B3B | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57128E
#57128E
oklch(37.7% 0.182 303)
- #394900
#394900
oklch(37.8% 0.092 122.7)
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 #57128E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo #4B0082 ΔE 0.039
- Chrysanthemum #560BAD ΔE 0.052
- Imperial Purple #480CA8 ΔE 0.057
- Royal Purple #4B006E ΔE 0.064
- Rebecca Purple #663399 ΔE 0.067
- Dark Slate Blue #483D8B ΔE 0.081
- Grape #7209B7 ΔE 0.084
- Indigo Blue #3A18B1 ΔE 0.087
Use #57128E 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.