#643F6E
Closest named color: Dusk (#4E5481). oklch(43% 0.087 318.9), rgb(100, 63, 110).
Aa
White text reads best on this color (8.47:1).
About this color
#643F6E is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.087 and its hue 319°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.066 away. White text reads best on it, at 8.47:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.087) |
| Temperature | in between |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.47:1 |
| White text | 8.47:1 |
Values
| HEX | #643F6E |
| RGB | rgb(100, 63, 110) |
| HSL | hsl(287, 27%, 34%) |
| OKLCH | oklch(43% 0.087 318.9) |
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 #643F6E | 8.47:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #643F6E | 2.47:1 | Fails | Lc 15.0 | Not readable |
| #643F6E text on white | 8.47:1 | AAA | Lc 89.0 | Fine for body text |
| #643F6E text on black | 2.47:1 | Fails | Lc -13.2 | 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
#F7F4F8
oklch(97.1% 0.006 317.8)
-
Step 100
100
#EEE7F0
oklch(93.6% 0.014 318.7)
-
Step 200
200
#E1D4E5
oklch(88.5% 0.027 318.2)
-
Step 300
300
#CFB7D6
oklch(80.9% 0.05 318.5)
-
Step 400
400
#B790C1
oklch(70.6% 0.082 319.3)
-
Step 500
500
#A574B2
oklch(63.1% 0.106 319.1)
-
Step 600
600
#8F5C9D
oklch(55.5% 0.113 318.8)
-
Step 700
700
#7A4C86
oklch(49.2% 0.104 319.1)
-
Step 800
800 (this color)
#643F6E
oklch(43% 0.087 318.9)
-
Step 900
900
#513558
oklch(37.6% 0.068 319.4)
-
Step 950
950
#2F1F34
oklch(26.9% 0.044 317.9)
#643F6E 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) | #384A70 | 0.075 |
| Deuteranopia (no green cones) | #424E6D | 0.068 |
| Tritanopia (no blue cones) | #644551 | 0.056 |
| Achromatopsia (no color) | #4D4D4D | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643F6E
#643F6E
oklch(43% 0.087 318.9)
- #355B2A
#355B2A
oklch(43% 0.088 139)
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 #643F6E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.066
- Brownish Purple #76424E ΔE 0.067
- Twilight #4E518B ΔE 0.068
- Dusty Grape #545775 ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.072
- Purple Brown #673A3F ΔE 0.076
- Rebecca Purple #663399 ΔE 0.080
- Light Eggplant #894585 ΔE 0.081
Use #643F6E 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.