#573B83
Closest named color: Dark Slate Blue (#483D8B). oklch(42% 0.117 299.3), rgb(87, 59, 131).
Aa
White text reads best on this color (8.90:1).
About this color
#573B83 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.117 and its hue 299°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.029 away. White text reads best on it, at 8.90:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.117) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.35:1 |
| White text | 8.90:1 |
Values
| HEX | #573B83 |
| RGB | rgb(87, 59, 131) |
| HSL | hsl(263, 38%, 37%) |
| OKLCH | oklch(42% 0.117 299.3) |
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 #573B83 | 8.90:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #573B83 | 2.35:1 | Fails | Lc 13.8 | Not readable |
| #573B83 text on white | 8.90:1 | AAA | Lc 90.2 | Preferred for body text |
| #573B83 text on black | 2.35:1 | Fails | Lc -12.1 | 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
#EBE7F6
oklch(93.5% 0.021 298.2)
-
Step 200
200
#DCD4EF
oklch(88.5% 0.038 299.2)
-
Step 300
300
#C6B7E7
oklch(80.8% 0.069 299.2)
-
Step 400
400
#AA91DB
oklch(70.7% 0.109 299.1)
-
Step 500
500
#9674D1
oklch(63.1% 0.139 299.3)
-
Step 600
600
#815ABF
oklch(55.6% 0.154 299.2)
-
Step 700
700
#6D4AA4
oklch(49.1% 0.141 299.1)
-
Step 800
800 (this color)
#573B83
oklch(42% 0.117 299.3)
-
Step 900
900
#49356B
oklch(37.8% 0.091 299.1)
-
Step 950
950
#2B1F3E
oklch(27% 0.058 300.4)
#573B83 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) | #1F4A85 | 0.082 |
| Deuteranopia (no green cones) | #284981 | 0.075 |
| Tritanopia (no blue cones) | #4E4959 | 0.090 |
| Achromatopsia (no color) | #4A4A4A | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #573B83
#573B83
oklch(42% 0.117 299.3)
- #475400
#475400
oklch(42% 0.099 119.5)
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 #573B83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.029
- Blueberry #464196 ΔE 0.043
- Rebecca Purple #663399 ΔE 0.049
- Twilight #4E518B ΔE 0.058
- Dusk #4E5481 ΔE 0.069
- Cobalt #1E488F ΔE 0.082
- Dusk Blue #26538D ΔE 0.086
- Dusty Grape #545775 ΔE 0.087
Use #573B83 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.