#57178A
Closest named color: Indigo (#4B0082). oklch(37.7% 0.174 303.9), rgb(87, 23, 138).
Aa
White text reads best on this color (11.08:1).
About this color
#57178A is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.174 and its hue 304°. 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 11.08:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.174) |
| Temperature | in between |
| Nearest name | Indigo (#4B0082) |
| Black text | 1.89:1 |
| White text | 11.08:1 |
Values
| HEX | #57178A |
| RGB | rgb(87, 23, 138) |
| HSL | hsl(273, 71%, 32%) |
| OKLCH | oklch(37.7% 0.174 303.9) |
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 #57178A | 11.08:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #57178A | 1.89:1 | Fails | Lc 9.4 | Not readable |
| #57178A text on white | 11.08:1 | AAA | Lc 94.5 | Preferred for body text |
| #57178A text on black | 1.89:1 | 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
#F8F3FF
oklch(97.1% 0.017 304.8)
-
Step 100
100
#EFE4FF
oklch(93.6% 0.038 304.1)
-
Step 200
200
#E3CFFF
oklch(88.6% 0.068 304)
-
Step 300
300
#D1ADFF
oklch(80.8% 0.119 304)
-
Step 400
400
#BB7DFF
oklch(70.7% 0.19 304)
-
Step 500
500
#AB50FF
oklch(63% 0.247 303.8)
-
Step 600
600
#9B02F8
oklch(55.6% 0.29 303.9)
-
Step 700
700
#8300D2
oklch(49.1% 0.256 304.1)
-
Step 800
800
#6C00AE
oklch(42.7% 0.223 304.2)
-
Step 900
900 (this color)
#57178A
oklch(37.7% 0.174 303.9)
-
Step 950
950
#331151
oklch(27.1% 0.111 304.1)
#57178A 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) | #003A8D | 0.124 |
| Deuteranopia (no green cones) | #003C88 | 0.126 |
| Tritanopia (no blue cones) | #4D3752 | 0.124 |
| Achromatopsia (no color) | #3C3C3C | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57178A
#57178A
oklch(37.7% 0.174 303.9)
- #384900
#384900
oklch(37.7% 0.093 123.4)
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 #57178A, 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 0.059
- Royal Purple #4B006E ΔE 0.062
- Imperial Purple #480CA8 ΔE 0.063
- Rebecca Purple #663399 ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.077
- Blueberry #464196 ΔE 0.087
- Grape #7209B7 ΔE 0.088
Use #57178A 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.