#643C92
Closest named color: Rebecca Purple (#663399). oklch(44.6% 0.138 302.6), rgb(100, 60, 146).
Aa
White text reads best on this color (8.06:1).
About this color
#643C92 is a dark, moderately saturated purple. In OKLCH its lightness is 45%, its chroma 0.138 and its hue 303°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.023 away. White text reads best on it, at 8.06:1.
| Hue family | Purples |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.138) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.60:1 |
| White text | 8.06:1 |
Values
| HEX | #643C92 |
| RGB | rgb(100, 60, 146) |
| HSL | hsl(268, 42%, 40%) |
| OKLCH | oklch(44.6% 0.138 302.6) |
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 #643C92 | 8.06:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #643C92 | 2.60:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #643C92 text on white | 8.06:1 | AAA | Lc 87.6 | Fine for body text |
| #643C92 text on black | 2.60:1 | Fails | Lc -14.5 | 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
#F7F4FC
oklch(97.2% 0.011 303.1)
-
Step 100
100
#EDE6F7
oklch(93.5% 0.024 304.5)
-
Step 200
200
#DFD3F2
oklch(88.6% 0.044 303.1)
-
Step 300
300
#CBB5EC
oklch(81% 0.08 302.9)
-
Step 400
400
#B08CE3
oklch(70.7% 0.129 302.3)
-
Step 500
500
#9E6CDA
oklch(63% 0.165 303)
-
Step 600
600
#8951C8
oklch(55.6% 0.18 302.6)
-
Step 700
700
#7441AD
oklch(49.1% 0.167 302.4)
-
Step 800
800 (this color)
#643C92
oklch(44.6% 0.138 302.6)
-
Step 900
900
#4D3070
oklch(37.7% 0.108 302.4)
-
Step 950
950
#2D1D42
oklch(27.1% 0.068 302)
#643C92 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) | #164F95 | 0.107 |
| Deuteranopia (no green cones) | #275090 | 0.097 |
| Tritanopia (no blue cones) | #5B4D61 | 0.103 |
| Achromatopsia (no color) | #505050 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643C92
#643C92
oklch(44.6% 0.138 302.6)
- #4A5D00
#4A5D00
oklch(44.6% 0.109 122.4)
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 #643C92, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.023
- Dark Slate Blue #483D8B ΔE 0.051
- Blueberry #464196 ΔE 0.053
- Twilight #4E518B ΔE 0.065
- Dusk #4E5481 ΔE 0.079
- Light Eggplant #894585 ΔE 0.082
- Bluey Purple #6241C7 ΔE 0.085
- Blue With A Hint Of Purple #533CC6 ΔE 0.090
Use #643C92 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.