#643A8C
Closest named color: Rebecca Purple (#663399). oklch(43.9% 0.134 305.2), rgb(100, 58, 140).
Aa
White text reads best on this color (8.31:1).
About this color
#643A8C is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.134 and its hue 305°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.027 away. White text reads best on it, at 8.31:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.134) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.52:1 |
| White text | 8.31:1 |
Values
| HEX | #643A8C |
| RGB | rgb(100, 58, 140) |
| HSL | hsl(271, 41%, 39%) |
| OKLCH | oklch(43.9% 0.134 305.2) |
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 #643A8C | 8.31:1 | AAA | Lc -93.0 | Preferred for body text |
| Black text on #643A8C | 2.52:1 | Fails | Lc 15.6 | Dividers and decoration only |
| #643A8C text on white | 8.31:1 | AAA | Lc 88.4 | Fine for body text |
| #643A8C text on black | 2.52:1 | Fails | Lc -13.8 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EDE6F6
oklch(93.5% 0.023 305.6)
-
Step 200
200
#E0D2F1
oklch(88.5% 0.045 305.9)
-
Step 300
300
#CCB4EA
oklch(80.8% 0.079 304.9)
-
Step 400
400
#B38CDF
oklch(70.8% 0.125 305)
-
Step 500
500
#A16CD6
oklch(63.1% 0.161 305.4)
-
Step 600
600
#8C51C3
oklch(55.6% 0.175 305.3)
-
Step 700
700
#7741A8
oklch(49.1% 0.162 305.4)
-
Step 800
800 (this color)
#643A8C
oklch(43.9% 0.134 305.2)
-
Step 900
900
#4F306D
oklch(37.7% 0.105 305.4)
-
Step 950
950
#2E1D40
oklch(27% 0.066 304.8)
#643A8C 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) | #1A4D8F | 0.107 |
| Deuteranopia (no green cones) | #2A4E8A | 0.096 |
| Tritanopia (no blue cones) | #5D4A5D | 0.098 |
| Achromatopsia (no color) | #4E4E4E | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643A8C
#643A8C
oklch(43.9% 0.134 305.2)
- #445C00
#445C00
oklch(43.9% 0.111 125.2)
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 #643A8C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.027
- Dark Slate Blue #483D8B ΔE 0.050
- Blueberry #464196 ΔE 0.056
- Twilight #4E518B ΔE 0.067
- Dusk #4E5481 ΔE 0.080
- Light Eggplant #894585 ΔE 0.081
- Purple #800080 ΔE 0.090
- Grape #7209B7 ΔE 0.095
Use #643A8C 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.