#643A71
Closest named color: Dark Slate Blue (#483D8B). oklch(42.3% 0.1 317.8), rgb(100, 58, 113).
Aa
White text reads best on this color (8.80:1).
About this color
#643A71 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.100 and its hue 318°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.067 away. White text reads best on it, at 8.80:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.100) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.38:1 |
| White text | 8.80:1 |
Values
| HEX | #643A71 |
| RGB | rgb(100, 58, 113) |
| HSL | hsl(286, 32%, 34%) |
| OKLCH | oklch(42.3% 0.1 317.8) |
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 #643A71 | 8.80:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #643A71 | 2.38:1 | Fails | Lc 14.1 | Not readable |
| #643A71 text on white | 8.80:1 | AAA | Lc 89.9 | Fine for body text |
| #643A71 text on black | 2.38:1 | Fails | Lc -12.4 | 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
#EFE6F1
oklch(93.5% 0.018 320.1)
-
Step 200
200
#E2D3E7
oklch(88.5% 0.031 317.7)
-
Step 300
300
#D1B5DA
oklch(80.9% 0.06 317.9)
-
Step 400
400
#B98EC7
oklch(70.7% 0.094 317.7)
-
Step 500
500
#A771B8
oklch(63.1% 0.119 317.8)
-
Step 600
600
#9258A4
oklch(55.6% 0.13 317.8)
-
Step 700
700
#7D488D
oklch(49.2% 0.121 318)
-
Step 800
800 (this color)
#643A71
oklch(42.3% 0.1 317.8)
-
Step 900
900
#53335C
oklch(37.7% 0.078 318.6)
-
Step 950
950
#301E36
oklch(26.9% 0.05 317.4)
#643A71 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) | #304873 | 0.089 |
| Deuteranopia (no green cones) | #3C4C6F | 0.080 |
| Tritanopia (no blue cones) | #644250 | 0.066 |
| Achromatopsia (no color) | #4A4A4A | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643A71
#643A71
oklch(42.3% 0.1 317.8)
- #305A1F
#305A1F
oklch(42.3% 0.1 137.8)
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 #643A71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.067
- Rebecca Purple #663399 ΔE 0.070
- Twilight #4E518B ΔE 0.074
- Dusk #4E5481 ΔE 0.076
- Brownish Purple #76424E ΔE 0.078
- Blueberry #464196 ΔE 0.080
- Dusty Grape #545775 ΔE 0.082
- Light Eggplant #894585 ΔE 0.083
Use #643A71 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.