#573C91
Closest named color: Dark Slate Blue (#483D8B). oklch(43.1% 0.135 294.8), rgb(87, 60, 145).
Aa
White text reads best on this color (8.53:1).
About this color
#573C91 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.135 and its hue 295°. 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 8.53:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.135) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.46:1 |
| White text | 8.53:1 |
Values
| HEX | #573C91 |
| RGB | rgb(87, 60, 145) |
| HSL | hsl(259, 41%, 40%) |
| OKLCH | oklch(43.1% 0.135 294.8) |
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 #573C91 | 8.53:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #573C91 | 2.46:1 | Fails | Lc 14.9 | Not readable |
| #573C91 text on white | 8.53:1 | AAA | Lc 89.0 | Fine for body text |
| #573C91 text on black | 2.46:1 | Fails | Lc -13.2 | 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
#C3B7EF
oklch(80.8% 0.079 294.4)
-
Step 400
400
#A690E7
oklch(70.7% 0.126 294.6)
-
Step 500
500
#9272DF
oklch(63.2% 0.16 294.9)
-
Step 600
600
#7D57CD
oklch(55.6% 0.175 294.9)
-
Step 700
700
#6947B1
oklch(49.1% 0.161 294.5)
-
Step 800
800 (this color)
#573C91
oklch(43.1% 0.135 294.8)
-
Step 900
900
#463373
oklch(37.6% 0.106 294.4)
-
Step 950
950
#291F43
oklch(27.1% 0.065 294.4)
#573C91 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) | #0D4D94 | 0.090 |
| Deuteranopia (no green cones) | #184B8F | 0.085 |
| Tritanopia (no blue cones) | #484E60 | 0.107 |
| Achromatopsia (no color) | #4C4C4C | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #573C91
#573C91
oklch(43.1% 0.135 294.8)
- #4F5600
#4F5600
oklch(43.2% 0.098 115.1)
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 #573C91, 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 0.031
- Rebecca Purple #663399 ΔE 0.035
- Twilight #4E518B ΔE 0.058
- Dusk #4E5481 ΔE 0.074
- Cobalt #1E488F ΔE 0.080
- Dusk Blue #26538D ΔE 0.085
- Chrysanthemum #560BAD ΔE 0.085
Use #573C91 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.