#57578B
Closest named color: Dusk (#4E5481). oklch(48% 0.083 282.8), rgb(87, 87, 139).
Aa
White text reads best on this color (6.68:1).
About this color
#57578B is a medium-dark, moderately saturated purple. In OKLCH its lightness is 48%, its chroma 0.083 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.023 away. White text reads best on it, at 6.68:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 3.14:1 |
| White text | 6.68:1 |
Values
| HEX | #57578B |
| RGB | rgb(87, 87, 139) |
| HSL | hsl(240, 23%, 44%) |
| OKLCH | oklch(48% 0.083 282.8) |
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 #57578B | 6.68:1 | AA | Lc -88.0 | Fine for body text |
| Black text on #57578B | 3.14:1 | AA large text | Lc 21.1 | Dividers and decoration only |
| #57578B text on white | 6.68:1 | AA | Lc 82.9 | Fine for body text |
| #57578B text on black | 3.14:1 | AA large text | Lc -19.0 | Dividers and decoration only |
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 700.
-
Step 50
50
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E8E9F2
oklch(93.6% 0.012 281.1)
-
Step 200
200
#D6D8E8
oklch(88.5% 0.022 280.3)
-
Step 300
300
#BCBEDA
oklch(80.9% 0.039 282.2)
-
Step 400
400
#9A9CC8
oklch(70.7% 0.064 282.6)
-
Step 500
500
#8283BA
oklch(63.1% 0.082 283)
-
Step 600
600
#6C6CA6
oklch(55.6% 0.089 283.1)
-
Step 700
700 (this color)
#57578B
oklch(48% 0.083 282.8)
-
Step 800
800
#4A4A74
oklch(42.8% 0.069 283.1)
-
Step 900
900
#3D3E5D
oklch(37.7% 0.053 282.1)
-
Step 950
950
#242437
oklch(26.9% 0.035 283.8)
#57578B 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) | #465E8D | 0.029 |
| Deuteranopia (no green cones) | #445A8A | 0.027 |
| Tritanopia (no blue cones) | #49616A | 0.072 |
| Achromatopsia (no color) | #5C5C5C | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57578B
#57578B
oklch(48% 0.083 282.8)
- #665F21
#665F21
oklch(47.9% 0.082 102.9)
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 #57578B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.023
- Twilight #4E518B ΔE 0.023
- Dusky Blue #475F94 ΔE 0.030
- Dusty Grape #545775 ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.038
- Denim #3B638C ΔE 0.047
- YInMn Blue #415A77 ΔE 0.049
- Light Navy Blue #2E5A88 ΔE 0.052
Use #57578B 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.