#57428B
Closest named color: Dark Slate Blue (#483D8B). oklch(43.8% 0.117 294.3), rgb(87, 66, 139).
Aa
White text reads best on this color (8.21:1).
About this color
#57428B is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.117 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 8.21:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.117) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.55:1 |
| White text | 8.21:1 |
Values
| HEX | #57428B |
| RGB | rgb(87, 66, 139) |
| HSL | hsl(257, 36%, 40%) |
| OKLCH | oklch(43.8% 0.117 294.3) |
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 #57428B | 8.21:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #57428B | 2.55:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #57428B text on white | 8.21:1 | AAA | Lc 88.2 | Fine for body text |
| #57428B text on black | 2.55:1 | 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
#DAD5F0
oklch(88.5% 0.037 294.1)
-
Step 300
300
#C3B9E9
oklch(81% 0.068 294.4)
-
Step 400
400
#A593DE
oklch(70.8% 0.109 294.5)
-
Step 500
500
#8F76D5
oklch(63% 0.14 294.1)
-
Step 600
600
#7A5DC2
oklch(55.6% 0.152 294.1)
-
Step 700
700
#674CA7
oklch(49% 0.141 294.3)
-
Step 800
800 (this color)
#57428B
oklch(43.8% 0.117 294.3)
-
Step 900
900
#45366D
oklch(37.7% 0.092 294.1)
-
Step 950
950
#282040
oklch(27% 0.059 293.6)
#57428B 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) | #26508E | 0.071 |
| Deuteranopia (no green cones) | #2A4E89 | 0.068 |
| Tritanopia (no blue cones) | #4A5160 | 0.095 |
| Achromatopsia (no color) | #4F4F4F | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57428B
#57428B
oklch(43.8% 0.117 294.3)
- #515700
#515700
oklch(43.6% 0.098 114.3)
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 #57428B, 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 0.041
- Rebecca Purple #663399 ΔE 0.049
- Dusk #4E5481 ΔE 0.056
- Denim Blue #3B5B92 ΔE 0.074
- Dusk Blue #26538D ΔE 0.075
- Cobalt #1E488F ΔE 0.076
Use #57428B 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.