#573B66
Closest named color: Dark Slate Blue (#483D8B). oklch(40.2% 0.078 313.1), rgb(87, 59, 102).
Aa
White text reads best on this color (9.44:1).
About this color
#573B66 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.078 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 9.44:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.078) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.22:1 |
| White text | 9.44:1 |
Values
| HEX | #573B66 |
| RGB | rgb(87, 59, 102) |
| HSL | hsl(279, 27%, 32%) |
| OKLCH | oklch(40.2% 0.078 313.1) |
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 #573B66 | 9.44:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #573B66 | 2.22:1 | Fails | Lc 12.2 | Not readable |
| #573B66 text on white | 9.44:1 | AAA | Lc 91.7 | Preferred for body text |
| #573B66 text on black | 2.22:1 | Fails | Lc -10.7 | 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
#F7F4F8
oklch(97.1% 0.006 317.8)
-
Step 100
100
#EDE7F0
oklch(93.5% 0.014 314.8)
-
Step 200
200
#DFD5E5
oklch(88.6% 0.024 313.1)
-
Step 300
300
#CBB9D6
oklch(81% 0.045 312.8)
-
Step 400
400
#B194C1
oklch(70.8% 0.072 313.4)
-
Step 500
500
#9D79B2
oklch(63.2% 0.093 312.6)
-
Step 600
600
#88619D
oklch(55.6% 0.1 313.2)
-
Step 700
700
#735086
oklch(49.1% 0.093 313)
-
Step 800
800 (this color)
#573B66
oklch(40.2% 0.078 313.1)
-
Step 900
900
#4D3858
oklch(37.8% 0.059 313.6)
-
Step 950
950
#2D2134
oklch(27.1% 0.038 312.6)
#573B66 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) | #334468 | 0.062 |
| Deuteranopia (no green cones) | #3A4765 | 0.057 |
| Tritanopia (no blue cones) | #56414B | 0.054 |
| Achromatopsia (no color) | #464646 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #573B66
#573B66
oklch(40.2% 0.078 313.1)
- #375123
#375123
oklch(40.2% 0.078 133.2)
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 #573B66, 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 0.072
- Dusk #4E5481 ΔE 0.075
- Twilight #4E518B ΔE 0.077
- Dusty Grape #545775 ΔE 0.078
- Brownish Purple #76424E ΔE 0.080
- Dark Grey Blue #29465B ΔE 0.081
- Blueberry #464196 ΔE 0.084
Use #573B66 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.