#573C8B
Closest named color: Dark Slate Blue (#483D8B). oklch(42.7% 0.127 296.4), rgb(87, 60, 139).
Aa
White text reads best on this color (8.66:1).
About this color
#573C8B is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.127 and its hue 296°. 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 8.66:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.127) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.42:1 |
| White text | 8.66:1 |
Values
| HEX | #573C8B |
| RGB | rgb(87, 60, 139) |
| HSL | hsl(261, 40%, 39%) |
| OKLCH | oklch(42.7% 0.127 296.4) |
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 #573C8B | 8.66:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #573C8B | 2.42:1 | Fails | Lc 14.5 | Not readable |
| #573C8B text on white | 8.66:1 | AAA | Lc 89.4 | Fine for body text |
| #573C8B text on black | 2.42:1 | Fails | Lc -12.8 | 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
#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
#A890E2
oklch(70.7% 0.12 296.7)
-
Step 500
500
#9373D9
oklch(63.1% 0.151 296.3)
-
Step 600
600
#7E59C7
oklch(55.6% 0.165 296.1)
-
Step 700
700
#6B48AC
oklch(49.1% 0.154 296.4)
-
Step 800
800 (this color)
#573C8B
oklch(42.7% 0.127 296.4)
-
Step 900
900
#47346F
oklch(37.6% 0.099 296.2)
-
Step 950
950
#2A1F41
oklch(27% 0.062 297)
#573C8B 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) | #184C8E | 0.085 |
| Deuteranopia (no green cones) | #214A89 | 0.079 |
| Tritanopia (no blue cones) | #4B4C5D | 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°).
- #573C8B
#573C8B
oklch(42.7% 0.127 296.4)
- #4C5500
#4C5500
oklch(42.7% 0.098 116.6)
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 #573C8B, 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 0.035
- Rebecca Purple #663399 ΔE 0.040
- Twilight #4E518B ΔE 0.056
- Dusk #4E5481 ΔE 0.070
- Cobalt #1E488F ΔE 0.080
- Dusk Blue #26538D ΔE 0.084
- Denim Blue #3B5B92 ΔE 0.087
Use #573C8B 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.