#573B9E
Closest named color: Rebecca Purple (#663399). oklch(44% 0.153 291.9), rgb(87, 59, 158).
Aa
White text reads best on this color (8.31:1).
About this color
#573B9E is a dark, vivid purple. In OKLCH its lightness is 44%, its chroma 0.153 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.032 away. White text reads best on it, at 8.31:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | vivid (0.153) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.52:1 |
| White text | 8.31:1 |
Values
| HEX | #573B9E |
| RGB | rgb(87, 59, 158) |
| HSL | hsl(257, 46%, 43%) |
| OKLCH | oklch(44% 0.153 291.9) |
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 #573B9E | 8.31:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #573B9E | 2.52:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #573B9E text on white | 8.31:1 | AAA | Lc 88.3 | Fine for body text |
| #573B9E text on black | 2.52:1 | Fails | Lc -13.9 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#EAE7FA
oklch(93.6% 0.026 293.1)
-
Step 200
200
#D9D4F8
oklch(88.5% 0.049 291.7)
-
Step 300
300
#C1B7F6
oklch(81% 0.088 291.6)
-
Step 400
400
#A38EF2
oklch(70.7% 0.144 292)
-
Step 500
500
#8E6EED
oklch(63% 0.184 291.9)
-
Step 600
600
#7A52DB
oklch(55.5% 0.199 292.1)
-
Step 700
700
#6742BE
oklch(49.1% 0.184 291.9)
-
Step 800
800 (this color)
#573B9E
oklch(44% 0.153 291.9)
-
Step 900
900
#45317A
oklch(37.7% 0.119 292.4)
-
Step 950
950
#281E48
oklch(27.1% 0.075 291.5)
#573B9E 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) | #0050A1 | 0.094 |
| Deuteranopia (no green cones) | #004C9C | 0.093 |
| Tritanopia (no blue cones) | #425267 | 0.123 |
| Achromatopsia (no color) | #4E4E4E | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #573B9E
#573B9E
oklch(44% 0.153 291.9)
- #545700
#545700
oklch(43.9% 0.097 112.1)
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 #573B9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.032
- Blueberry #464196 ΔE 0.033
- Dark Slate Blue #483D8B ΔE 0.041
- Blue With A Hint Of Purple #533CC6 ΔE 0.065
- Twilight #4E518B ΔE 0.068
- Bluey Purple #6241C7 ΔE 0.069
- Chrysanthemum #560BAD ΔE 0.072
- Blurple #5539CC ΔE 0.074
Use #573B9E 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.