#57428C
Closest named color: Dark Slate Blue (#483D8B). oklch(43.9% 0.118 294.1), rgb(87, 66, 140).
Aa
White text reads best on this color (8.19:1).
About this color
#57428C is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.118 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.030 away. White text reads best on it, at 8.19:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.118) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.56:1 |
| White text | 8.19:1 |
Values
| HEX | #57428C |
| RGB | rgb(87, 66, 140) |
| HSL | hsl(257, 36%, 40%) |
| OKLCH | oklch(43.9% 0.118 294.1) |
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 #57428C | 8.19:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #57428C | 2.56:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #57428C text on white | 8.19:1 | AAA | Lc 88.1 | Fine for body text |
| #57428C text on black | 2.56:1 | Fails | Lc -14.0 | 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 800.
-
Step 50
50
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EAE8F6
oklch(93.7% 0.019 292.6)
-
Step 200
200
#DAD5F1
oklch(88.6% 0.038 293.8)
-
Step 300
300
#C2B9EA
oklch(81% 0.069 293.2)
-
Step 400
400
#A493DF
oklch(70.7% 0.11 293.7)
-
Step 500
500
#8F76D6
oklch(63.1% 0.142 293.9)
-
Step 600
600
#7A5DC3
oklch(55.6% 0.153 293.9)
-
Step 700
700
#674CA8
oklch(49.1% 0.142 294.1)
-
Step 800
800 (this color)
#57428C
oklch(43.9% 0.118 294.1)
-
Step 900
900
#45366D
oklch(37.7% 0.092 294.1)
-
Step 950
950
#282040
oklch(27% 0.059 293.6)
#57428C 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) | #25508F | 0.072 |
| Deuteranopia (no green cones) | #294E8A | 0.069 |
| Tritanopia (no blue cones) | #4A5160 | 0.096 |
| Achromatopsia (no color) | #4F4F4F | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57428C
#57428C
oklch(43.9% 0.118 294.1)
- #525800
#525800
oklch(44% 0.099 114.3)
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 #57428C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.030
- Blueberry #464196 ΔE 0.034
- Twilight #4E518B ΔE 0.042
- Rebecca Purple #663399 ΔE 0.048
- Dusk #4E5481 ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.074
- Dusk Blue #26538D ΔE 0.075
- Cobalt #1E488F ΔE 0.076
Use #57428C 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.