#573A66
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.08 313.5), rgb(87, 58, 102).
Aa
White text reads best on this color (9.53:1).
About this color
#573A66 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.080 and its hue 313°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.067 away. White text reads best on it, at 9.53:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.080) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.20:1 |
| White text | 9.53:1 |
Values
| HEX | #573A66 |
| RGB | rgb(87, 58, 102) |
| HSL | hsl(280, 28%, 31%) |
| OKLCH | oklch(40.1% 0.08 313.5) |
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 #573A66 | 9.53:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #573A66 | 2.20:1 | Fails | Lc 12.0 | Not readable |
| #573A66 text on white | 9.53:1 | AAA | Lc 91.9 | Preferred for body text |
| #573A66 text on black | 2.20:1 | Fails | Lc -10.5 | 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
#F7F4F9
oklch(97.1% 0.007 312.3)
-
Step 100
100
#EEE7F2
oklch(93.7% 0.016 313.6)
-
Step 200
200
#E1D3E9
oklch(88.5% 0.033 313.5)
-
Step 300
300
#CFB6DC
oklch(81% 0.059 314.1)
-
Step 400
400
#B68FCB
oklch(70.7% 0.095 313.5)
-
Step 500
500
#A472BD
oklch(63.1% 0.122 313.8)
-
Step 600
600
#8F59AA
oklch(55.7% 0.133 313.5)
-
Step 700
700
#794991
oklch(49.1% 0.122 313.5)
-
Step 800
800
#633C76
oklch(42.8% 0.102 313.8)
-
Step 900
900 (this color)
#573A66
oklch(40.1% 0.08 313.5)
-
Step 950
950
#2F1F38
oklch(27.1% 0.05 312.7)
#573A66 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) | #324468 | 0.064 |
| Deuteranopia (no green cones) | #394665 | 0.058 |
| Tritanopia (no blue cones) | #56404B | 0.054 |
| Achromatopsia (no color) | #454545 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #573A66
#573A66
oklch(40.1% 0.08 313.5)
- #365122
#365122
oklch(40.1% 0.079 133.6)
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 #573A66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.067
- Purple Brown #673A3F ΔE 0.073
- Dusk #4E5481 ΔE 0.077
- Twilight #4E518B ΔE 0.079
- Dusty Grape #545775 ΔE 0.081
- Brownish Purple #76424E ΔE 0.081
- Dark Grey Blue #29465B ΔE 0.082
- Blueberry #464196 ΔE 0.084
Use #573A66 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.