#57337B
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.12 304.6), rgb(87, 51, 123).
Aa
White text reads best on this color (9.70:1).
About this color
#57337B is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.120 and its hue 305°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.042 away. White text reads best on it, at 9.70:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.120) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.16:1 |
| White text | 9.70:1 |
Values
| HEX | #57337B |
| RGB | rgb(87, 51, 123) |
| HSL | hsl(270, 41%, 34%) |
| OKLCH | oklch(40.1% 0.12 304.6) |
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 #57337B | 9.70:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #57337B | 2.16:1 | Fails | Lc 11.8 | Not readable |
| #57337B text on white | 9.70:1 | AAA | Lc 92.2 | Preferred for body text |
| #57337B text on black | 2.16:1 | Fails | Lc -10.2 | 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 900.
-
Step 50
50
#F7F4FC
oklch(97.2% 0.011 303.1)
-
Step 100
100
#EEE6F8
oklch(93.6% 0.025 305.8)
-
Step 200
200
#E0D1F4
oklch(88.4% 0.05 304.8)
-
Step 300
300
#CEB2F0
oklch(80.9% 0.091 305.1)
-
Step 400
400
#B588E8
oklch(70.7% 0.143 304.6)
-
Step 500
500
#A366E1
oklch(63% 0.184 304.6)
-
Step 600
600
#8F49CF
oklch(55.6% 0.2 304.7)
-
Step 700
700
#7A39B3
oklch(49.1% 0.186 304.9)
-
Step 800
800
#633091
oklch(42.7% 0.155 304.8)
-
Step 900
900 (this color)
#57337B
oklch(40.1% 0.12 304.6)
-
Step 950
950
#2F1B44
oklch(27.1% 0.076 304.3)
#57337B 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) | #17437D | 0.095 |
| Deuteranopia (no green cones) | #254479 | 0.085 |
| Tritanopia (no blue cones) | #514152 | 0.088 |
| Achromatopsia (no color) | #444444 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57337B
#57337B
oklch(40.1% 0.12 304.6)
- #3C5000
#3C5000
oklch(40% 0.1 124.5)
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 #57337B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.042
- Rebecca Purple #663399 ΔE 0.056
- Blueberry #464196 ΔE 0.059
- Twilight #4E518B ΔE 0.079
- Indigo #4B0082 ΔE 0.086
- Dusk #4E5481 ΔE 0.088
- Grape Purple #5D1451 ΔE 0.089
- Royal Purple #4B006E ΔE 0.092
Use #57337B 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.