#643671
Closest named color: Dark Slate Blue (#483D8B). oklch(41.6% 0.108 318.5), rgb(100, 54, 113).
Aa
White text reads best on this color (9.09:1).
About this color
#643671 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.108 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 9.09:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.108) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.30:1 |
| White text | 9.09:1 |
Values
| HEX | #643671 |
| RGB | rgb(100, 54, 113) |
| HSL | hsl(287, 35%, 33%) |
| OKLCH | oklch(41.6% 0.108 318.5) |
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 #643671 | 9.09:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #643671 | 2.30:1 | Fails | Lc 13.3 | Not readable |
| #643671 text on white | 9.09:1 | AAA | Lc 90.6 | Preferred for body text |
| #643671 text on black | 2.30:1 | Fails | Lc -11.7 | 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
#E3D2E8
oklch(88.4% 0.035 318.5)
-
Step 300
300
#D2B4DB
oklch(80.8% 0.063 318.3)
-
Step 400
400
#BB8CC9
oklch(70.6% 0.101 318.3)
-
Step 500
500
#AA6EBB
oklch(63% 0.129 318.6)
-
Step 600
600
#9555A7
oklch(55.6% 0.14 318.5)
-
Step 700
700
#7F458F
oklch(49.1% 0.13 318.6)
-
Step 800
800 (this color)
#643671
oklch(41.6% 0.108 318.5)
-
Step 900
900
#54325E
oklch(37.8% 0.083 318.3)
-
Step 950
950
#311D37
oklch(26.9% 0.054 318.2)
#643671 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) | #2B4573 | 0.097 |
| Deuteranopia (no green cones) | #394A6F | 0.087 |
| Tritanopia (no blue cones) | #643E4E | 0.069 |
| Achromatopsia (no color) | #484848 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643671
#643671
oklch(41.6% 0.108 318.5)
- #2A5919
#2A5919
oklch(41.6% 0.107 138.6)
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 #643671, 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 0.067
- Twilight #4E518B ΔE 0.081
- Blueberry #464196 ΔE 0.082
- Grape Purple #5D1451 ΔE 0.084
- Dusk #4E5481 ΔE 0.084
- Brownish Purple #76424E ΔE 0.084
- Rich Purple #720058 ΔE 0.086
Use #643671 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.