#573B8A
Closest named color: Dark Slate Blue (#483D8B). oklch(42.5% 0.127 297), rgb(87, 59, 138).
Aa
White text reads best on this color (8.75:1).
About this color
#573B8A is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.127 and its hue 297°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.026 away. White text reads best on it, at 8.75:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.127) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.39:1 |
| White text | 8.75:1 |
Values
| HEX | #573B8A |
| RGB | rgb(87, 59, 138) |
| HSL | hsl(261, 40%, 39%) |
| OKLCH | oklch(42.5% 0.127 297) |
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 #573B8A | 8.75:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #573B8A | 2.39:1 | Fails | Lc 14.3 | Not readable |
| #573B8A text on white | 8.75:1 | AAA | Lc 89.7 | Fine for body text |
| #573B8A text on black | 2.39:1 | Fails | Lc -12.5 | 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 800.
-
Step 50
50
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EBE7F7
oklch(93.6% 0.022 297.4)
-
Step 200
200
#DBD4F2
oklch(88.5% 0.041 296.2)
-
Step 300
300
#C5B7EB
oklch(80.9% 0.074 297.1)
-
Step 400
400
#A890E1
oklch(70.6% 0.118 296.9)
-
Step 500
500
#9472D9
oklch(63% 0.152 297)
-
Step 600
600
#7F59C6
oklch(55.6% 0.164 296.8)
-
Step 700
700
#6C48AB
oklch(49.1% 0.153 297.2)
-
Step 800
800 (this color)
#573B8A
oklch(42.5% 0.127 297)
-
Step 900
900
#48346F
oklch(37.8% 0.099 297.1)
-
Step 950
950
#2A1F41
oklch(27% 0.062 297)
#573B8A 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) | #174B8D | 0.087 |
| Deuteranopia (no green cones) | #204A88 | 0.081 |
| Tritanopia (no blue cones) | #4B4B5C | 0.100 |
| Achromatopsia (no color) | #4B4B4B | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #573B8A
#573B8A
oklch(42.5% 0.127 297)
- #4B5500
#4B5500
oklch(42.6% 0.098 117.3)
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 #573B8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.026
- Blueberry #464196 ΔE 0.036
- Rebecca Purple #663399 ΔE 0.040
- Twilight #4E518B ΔE 0.058
- Dusk #4E5481 ΔE 0.072
- Cobalt #1E488F ΔE 0.081
- Dusk Blue #26538D ΔE 0.086
- Denim Blue #3B5B92 ΔE 0.090
Use #573B8A 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.