#643C74
Closest named color: Dark Slate Blue (#483D8B). oklch(42.8% 0.1 315.7), rgb(100, 60, 116).
Aa
White text reads best on this color (8.60:1).
About this color
#643C74 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.100 and its hue 316°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.064 away. White text reads best on it, at 8.60:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.100) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.44:1 |
| White text | 8.60:1 |
Values
| HEX | #643C74 |
| RGB | rgb(100, 60, 116) |
| HSL | hsl(283, 32%, 35%) |
| OKLCH | oklch(42.8% 0.1 315.7) |
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 #643C74 | 8.60:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #643C74 | 2.44:1 | Fails | Lc 14.6 | Not readable |
| #643C74 text on white | 8.60:1 | AAA | Lc 89.3 | Fine for body text |
| #643C74 text on black | 2.44:1 | Fails | Lc -12.9 | 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
#F7F4F9
oklch(97.1% 0.007 312.3)
-
Step 100
100
#EEE7F2
oklch(93.7% 0.016 313.6)
-
Step 200
200
#E2D3E8
oklch(88.5% 0.033 316.4)
-
Step 300
300
#D0B6DB
oklch(81% 0.058 315.9)
-
Step 400
400
#B78FC9
oklch(70.8% 0.094 315.1)
-
Step 500
500
#A572BA
oklch(63.1% 0.119 315.7)
-
Step 600
600
#9059A6
oklch(55.6% 0.129 315.7)
-
Step 700
700
#7B488F
oklch(49.1% 0.122 315.8)
-
Step 800
800 (this color)
#643C74
oklch(42.8% 0.1 315.7)
-
Step 900
900
#51345E
oklch(37.7% 0.078 314.8)
-
Step 950
950
#301F37
oklch(27.2% 0.049 315.7)
#643C74 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) | #314976 | 0.086 |
| Deuteranopia (no green cones) | #3C4D72 | 0.078 |
| Tritanopia (no blue cones) | #634452 | 0.067 |
| Achromatopsia (no color) | #4C4C4C | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643C74
#643C74
oklch(42.8% 0.1 315.7)
- #345B1E
#345B1E
oklch(42.8% 0.1 136)
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 #643C74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.064
- Rebecca Purple #663399 ΔE 0.067
- Twilight #4E518B ΔE 0.068
- Dusk #4E5481 ΔE 0.071
- Blueberry #464196 ΔE 0.076
- Dusty Grape #545775 ΔE 0.077
- Brownish Purple #76424E ΔE 0.079
- Light Eggplant #894585 ΔE 0.080
Use #643C74 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.