#643C72
Closest named color: Dark Slate Blue (#483D8B). oklch(42.7% 0.098 316.9), rgb(100, 60, 114).
Aa
White text reads best on this color (8.63:1).
About this color
#643C72 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.098 and its hue 317°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.066 away. White text reads best on it, at 8.63:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.098) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.43:1 |
| White text | 8.63:1 |
Values
| HEX | #643C72 |
| RGB | rgb(100, 60, 114) |
| HSL | hsl(284, 31%, 34%) |
| OKLCH | oklch(42.7% 0.098 316.9) |
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 #643C72 | 8.63:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #643C72 | 2.43:1 | Fails | Lc 14.5 | Not readable |
| #643C72 text on white | 8.63:1 | AAA | Lc 89.4 | Fine for body text |
| #643C72 text on black | 2.43:1 | Fails | Lc -12.8 | 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
#F8F4F9
oklch(97.2% 0.008 319.4)
-
Step 100
100
#EEE7F1
oklch(93.6% 0.015 316)
-
Step 200
200
#E2D3E7
oklch(88.5% 0.031 317.7)
-
Step 300
300
#D0B6DA
oklch(81% 0.057 316.6)
-
Step 400
400
#B88FC7
oklch(70.8% 0.092 316.8)
-
Step 500
500
#A672B8
oklch(63.1% 0.117 317.1)
-
Step 600
600
#9159A4
oklch(55.6% 0.127 317.1)
-
Step 700
700
#7B498D
oklch(49.1% 0.118 316.6)
-
Step 800
800 (this color)
#643C72
oklch(42.7% 0.098 316.9)
-
Step 900
900
#52345C
oklch(37.8% 0.076 317.4)
-
Step 950
950
#301F36
oklch(27.1% 0.047 317)
#643C72 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) | #324974 | 0.085 |
| Deuteranopia (no green cones) | #3D4D70 | 0.077 |
| Tritanopia (no blue cones) | #644351 | 0.064 |
| Achromatopsia (no color) | #4C4C4C | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643C72
#643C72
oklch(42.7% 0.098 316.9)
- #335B21
#335B21
oklch(42.7% 0.098 137.2)
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 #643C72, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.066
- Twilight #4E518B ΔE 0.069
- Rebecca Purple #663399 ΔE 0.070
- Dusk #4E5481 ΔE 0.071
- Brownish Purple #76424E ΔE 0.077
- Dusty Grape #545775 ΔE 0.077
- Blueberry #464196 ΔE 0.079
- Light Eggplant #894585 ΔE 0.081
Use #643C72 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.