#573D91
Closest named color: Dark Slate Blue (#483D8B). oklch(43.3% 0.133 294.5), rgb(87, 61, 145).
Aa
White text reads best on this color (8.46:1).
About this color
#573D91 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.133 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.028 away. White text reads best on it, at 8.46:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.133) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.48:1 |
| White text | 8.46:1 |
Values
| HEX | #573D91 |
| RGB | rgb(87, 61, 145) |
| HSL | hsl(259, 41%, 40%) |
| OKLCH | oklch(43.3% 0.133 294.5) |
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 #573D91 | 8.46:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #573D91 | 2.48:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #573D91 text on white | 8.46:1 | AAA | Lc 88.8 | Fine for body text |
| #573D91 text on black | 2.48:1 | Fails | Lc -13.4 | 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
#F6F4FC
oklch(97.1% 0.011 297.6)
-
Step 100
100
#EAE7F8
oklch(93.5% 0.023 294.1)
-
Step 200
200
#DAD4F4
oklch(88.5% 0.044 294.1)
-
Step 300
300
#C3B7EE
oklch(80.8% 0.078 294.6)
-
Step 400
400
#A690E6
oklch(70.7% 0.125 294.8)
-
Step 500
500
#9172DF
oklch(63.1% 0.16 294.5)
-
Step 600
600
#7C58CC
oklch(55.6% 0.173 294.4)
-
Step 700
700
#6947B1
oklch(49.1% 0.161 294.5)
-
Step 800
800 (this color)
#573D91
oklch(43.3% 0.133 294.5)
-
Step 900
900
#463472
oklch(37.7% 0.103 294.3)
-
Step 950
950
#291F43
oklch(27.1% 0.065 294.4)
#573D91 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) | #114E94 | 0.088 |
| Deuteranopia (no green cones) | #1A4C8F | 0.083 |
| Tritanopia (no blue cones) | #484F61 | 0.106 |
| Achromatopsia (no color) | #4D4D4D | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #573D91
#573D91
oklch(43.3% 0.133 294.5)
- #505600
#505600
oklch(43.3% 0.098 114.4)
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 #573D91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.028
- Blueberry #464196 ΔE 0.030
- Rebecca Purple #663399 ΔE 0.036
- Twilight #4E518B ΔE 0.056
- Dusk #4E5481 ΔE 0.072
- Cobalt #1E488F ΔE 0.079
- Dusk Blue #26538D ΔE 0.083
- Denim Blue #3B5B92 ΔE 0.085
Use #573D91 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.