#643E7D
Closest named color: Rebecca Purple (#663399). oklch(43.6% 0.108 310.5), rgb(100, 62, 125).
Aa
White text reads best on this color (8.31:1).
About this color
#643E7D is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.108 and its hue 310°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.055 away. White text reads best on it, at 8.31:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.108) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.52:1 |
| White text | 8.31:1 |
Values
| HEX | #643E7D |
| RGB | rgb(100, 62, 125) |
| HSL | hsl(276, 34%, 37%) |
| OKLCH | oklch(43.6% 0.108 310.5) |
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 #643E7D | 8.31:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #643E7D | 2.52:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #643E7D text on white | 8.31:1 | AAA | Lc 88.5 | Fine for body text |
| #643E7D text on black | 2.52:1 | Fails | Lc -13.7 | 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
#F7F4FA
oklch(97.1% 0.009 308.4)
-
Step 100
100
#EEE7F3
oklch(93.7% 0.018 311.6)
-
Step 200
200
#E0D3EB
oklch(88.5% 0.035 309.7)
-
Step 300
300
#CDB6DF
oklch(80.9% 0.062 310.2)
-
Step 400
400
#B48FCF
oklch(70.7% 0.1 310.3)
-
Step 500
500
#A271C3
oklch(63.1% 0.13 310.6)
-
Step 600
600
#8D58AF
oklch(55.6% 0.14 310.7)
-
Step 700
700
#784897
oklch(49.2% 0.131 310.5)
-
Step 800
800 (this color)
#643E7D
oklch(43.6% 0.108 310.5)
-
Step 900
900
#4F3362
oklch(37.5% 0.084 310.4)
-
Step 950
950
#2F1E3A
oklch(27% 0.055 311.1)
#643E7D 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) | #2F4C7F | 0.087 |
| Deuteranopia (no green cones) | #394F7B | 0.080 |
| Tritanopia (no blue cones) | #614857 | 0.076 |
| Achromatopsia (no color) | #4E4E4E | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643E7D
#643E7D
oklch(43.6% 0.108 310.5)
- #3C5D11
#3C5D11
oklch(43.7% 0.108 130.8)
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 #643E7D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.056
- Twilight #4E518B ΔE 0.060
- Dusk #4E5481 ΔE 0.066
- Blueberry #464196 ΔE 0.066
- Light Eggplant #894585 ΔE 0.075
- Dusty Grape #545775 ΔE 0.077
- Brownish Purple #76424E ΔE 0.090
Use #643E7D 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.