#643871
Closest named color: Dark Slate Blue (#483D8B). oklch(41.9% 0.104 318.2), rgb(100, 56, 113).
Aa
White text reads best on this color (8.95:1).
About this color
#643871 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.104 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 8.95:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.104) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.34:1 |
| White text | 8.95:1 |
Values
| HEX | #643871 |
| RGB | rgb(100, 56, 113) |
| HSL | hsl(286, 34%, 33%) |
| OKLCH | oklch(41.9% 0.104 318.2) |
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 #643871 | 8.95:1 | AAA | Lc -94.7 | Preferred for body text |
| Black text on #643871 | 2.34:1 | Fails | Lc 13.7 | Not readable |
| #643871 text on white | 8.95:1 | AAA | Lc 90.3 | Preferred for body text |
| #643871 text on black | 2.34:1 | Fails | Lc -12.0 | 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
#EFE6F2
oklch(93.5% 0.019 317.7)
-
Step 200
200
#E3D3E8
oklch(88.6% 0.033 318.1)
-
Step 300
300
#D2B5DA
oklch(81% 0.06 318.9)
-
Step 400
400
#BA8DC8
oklch(70.6% 0.098 318)
-
Step 500
500
#A970BA
oklch(63.2% 0.124 318.2)
-
Step 600
600
#9457A6
oklch(55.7% 0.135 318.2)
-
Step 700
700
#7E468E
oklch(49.1% 0.126 318.4)
-
Step 800
800 (this color)
#643871
oklch(41.9% 0.104 318.2)
-
Step 900
900
#53325D
oklch(37.6% 0.082 318.1)
-
Step 950
950
#311E37
oklch(27.1% 0.052 317.8)
#643871 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) | #2E4673 | 0.092 |
| Deuteranopia (no green cones) | #3B4B6F | 0.083 |
| Tritanopia (no blue cones) | #64404F | 0.067 |
| Achromatopsia (no color) | #494949 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643871
#643871
oklch(41.9% 0.104 318.2)
- #2D5A1C
#2D5A1C
oklch(42.1% 0.105 138.2)
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 #643871, 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 0.069
- Twilight #4E518B ΔE 0.077
- Dusk #4E5481 ΔE 0.080
- Blueberry #464196 ΔE 0.081
- Brownish Purple #76424E ΔE 0.081
- Light Eggplant #894585 ΔE 0.086
- Dusty Grape #545775 ΔE 0.086
Use #643871 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.