#643666
Closest named color: Purple Brown (#673A3F). oklch(41% 0.095 325.6), rgb(100, 54, 102).
Aa
White text reads best on this color (9.28:1).
About this color
#643666 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.095 and its hue 326°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.071 away. White text reads best on it, at 9.28:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.095) |
| Temperature | in between |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.26:1 |
| White text | 9.28:1 |
Values
| HEX | #643666 |
| RGB | rgb(100, 54, 102) |
| HSL | hsl(298, 31%, 31%) |
| OKLCH | oklch(41% 0.095 325.6) |
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 #643666 | 9.28:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #643666 | 2.26:1 | Fails | Lc 12.8 | Not readable |
| #643666 text on white | 9.28:1 | AAA | Lc 91.2 | Preferred for body text |
| #643666 text on black | 2.26:1 | Fails | Lc -11.2 | 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 800.
-
Step 50
50
#F8F4F8
oklch(97.1% 0.007 325.6)
-
Step 100
100
#F0E6F0
oklch(93.6% 0.017 325.7)
-
Step 200
200
#E4D2E4
oklch(88.4% 0.031 325.8)
-
Step 300
300
#D4B5D4
oklch(80.9% 0.055 326.1)
-
Step 400
400
#BE8DBF
oklch(70.7% 0.09 325.8)
-
Step 500
500
#AD70AF
oklch(63.2% 0.115 325.7)
-
Step 600
600
#98579A
oklch(55.6% 0.124 326)
-
Step 700
700
#814784
oklch(49.1% 0.115 325.4)
-
Step 800
800 (this color)
#643666
oklch(41% 0.095 325.6)
-
Step 900
900
#553357
oklch(37.7% 0.074 324.9)
-
Step 950
950
#321E33
oklch(27% 0.047 325.1)
#643666 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) | #314368 | 0.090 |
| Deuteranopia (no green cones) | #3E4965 | 0.081 |
| Tritanopia (no blue cones) | #663B49 | 0.055 |
| Achromatopsia (no color) | #474747 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643666
#643666
oklch(41% 0.095 325.6)
- #225728
#225728
oklch(40.8% 0.095 145.7)
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 #643666, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.071
- Brownish Purple #76424E ΔE 0.071
- Grape Purple #5D1451 ΔE 0.078
- Velvet #750851 ΔE 0.079
- Dark Slate Blue #483D8B ΔE 0.080
- Rich Purple #720058 ΔE 0.083
- Rebecca Purple #663399 ΔE 0.086
- Dusk #4E5481 ΔE 0.088
Use #643666 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.