#643B75
Closest named color: Dark Slate Blue (#483D8B). oklch(42.6% 0.103 315.3), rgb(100, 59, 117).
Aa
White text reads best on this color (8.66:1).
About this color
#643B75 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.103 and its hue 315°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.062 away. White text reads best on it, at 8.66:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.103) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.42:1 |
| White text | 8.66:1 |
Values
| HEX | #643B75 |
| RGB | rgb(100, 59, 117) |
| HSL | hsl(282, 33%, 35%) |
| OKLCH | oklch(42.6% 0.103 315.3) |
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 #643B75 | 8.66:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #643B75 | 2.42:1 | Fails | Lc 14.5 | Not readable |
| #643B75 text on white | 8.66:1 | AAA | Lc 89.5 | Fine for body text |
| #643B75 text on black | 2.42:1 | Fails | Lc -12.7 | 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
#F7F4F9
oklch(97.1% 0.007 312.3)
-
Step 100
100
#EEE7F2
oklch(93.7% 0.016 313.6)
-
Step 200
200
#E2D3E9
oklch(88.6% 0.034 315.2)
-
Step 300
300
#D0B5DC
oklch(80.9% 0.061 315.5)
-
Step 400
400
#B88ECA
oklch(70.7% 0.097 315.5)
-
Step 500
500
#A671BC
oklch(63.1% 0.123 315.5)
-
Step 600
600
#9158A8
oklch(55.6% 0.134 315.6)
-
Step 700
700
#7B4790
oklch(49% 0.125 315.5)
-
Step 800
800 (this color)
#643B75
oklch(42.6% 0.103 315.3)
-
Step 900
900
#52335F
oklch(37.7% 0.082 315.4)
-
Step 950
950
#301E37
oklch(26.9% 0.051 316.1)
#643B75 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) | #304977 | 0.088 |
| Deuteranopia (no green cones) | #3B4D73 | 0.080 |
| Tritanopia (no blue cones) | #634452 | 0.070 |
| Achromatopsia (no color) | #4B4B4B | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643B75
#643B75
oklch(42.6% 0.103 315.3)
- #345B1A
#345B1A
oklch(42.7% 0.104 135.2)
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 #643B75, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.062
- Rebecca Purple #663399 ΔE 0.064
- Twilight #4E518B ΔE 0.069
- Dusk #4E5481 ΔE 0.073
- Blueberry #464196 ΔE 0.075
- Dusty Grape #545775 ΔE 0.080
- Light Eggplant #894585 ΔE 0.081
- Brownish Purple #76424E ΔE 0.082
Use #643B75 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.