#573D99
Closest named color: Blueberry (#464196). oklch(43.9% 0.144 292.5), rgb(87, 61, 153).
Aa
White text reads best on this color (8.29:1).
About this color
#573D99 is a dark, vivid purple. In OKLCH its lightness is 44%, its chroma 0.144 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.030 away. White text reads best on it, at 8.29:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | vivid (0.144) |
| Temperature | in between |
| Nearest name | Blueberry (#464196) |
| Black text | 2.53:1 |
| White text | 8.29:1 |
Values
| HEX | #573D99 |
| RGB | rgb(87, 61, 153) |
| HSL | hsl(257, 43%, 42%) |
| OKLCH | oklch(43.9% 0.144 292.5) |
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 #573D99 | 8.29:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #573D99 | 2.53:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #573D99 text on white | 8.29:1 | AAA | Lc 88.3 | Fine for body text |
| #573D99 text on black | 2.53:1 | 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
#EAE7F9
oklch(93.6% 0.024 293.6)
-
Step 200
200
#D9D4F6
oklch(88.5% 0.047 292.2)
-
Step 300
300
#C2B7F3
oklch(80.9% 0.084 292.8)
-
Step 400
400
#A48FED
oklch(70.7% 0.136 292.9)
-
Step 500
500
#8F71E7
oklch(63.2% 0.172 292.5)
-
Step 600
600
#7A56D5
oklch(55.7% 0.187 292.3)
-
Step 700
700
#6745B8
oklch(49.1% 0.173 292.5)
-
Step 800
800 (this color)
#573D99
oklch(43.9% 0.144 292.5)
-
Step 900
900
#453377
oklch(37.8% 0.112 292.4)
-
Step 950
950
#281E46
oklch(27% 0.072 292.4)
#573D99 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) | #00509C | 0.093 |
| Deuteranopia (no green cones) | #084C97 | 0.090 |
| Tritanopia (no blue cones) | #455165 | 0.115 |
| Achromatopsia (no color) | #4E4E4E | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #573D99
#573D99
oklch(43.9% 0.144 292.5)
- #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 #573D99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.030
- Rebecca Purple #663399 ΔE 0.033
- Dark Slate Blue #483D8B ΔE 0.035
- Twilight #4E518B ΔE 0.060
- Blue With A Hint Of Purple #533CC6 ΔE 0.073
- Bluey Purple #6241C7 ΔE 0.076
- Dusk #4E5481 ΔE 0.078
- Chrysanthemum #560BAD ΔE 0.080
Use #573D99 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.