#643E96
Closest named color: Rebecca Purple (#663399). oklch(45.2% 0.14 300.9), rgb(100, 62, 150).
Aa
White text reads best on this color (7.86:1).
About this color
#643E96 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 45%, its chroma 0.140 and its hue 301°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.025 away. White text reads best on it, at 7.86:1.
| Hue family | Purples |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.140) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.67:1 |
| White text | 7.86:1 |
Values
| HEX | #643E96 |
| RGB | rgb(100, 62, 150) |
| HSL | hsl(266, 42%, 42%) |
| OKLCH | oklch(45.2% 0.14 300.9) |
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 #643E96 | 7.86:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #643E96 | 2.67:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #643E96 text on white | 7.86:1 | AAA | Lc 86.9 | Fine for body text |
| #643E96 text on black | 2.67:1 | Fails | Lc -15.2 | Dividers and decoration only |
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
#F6F4FC
oklch(97.1% 0.011 297.6)
-
Step 100
100
#ECE7F8
oklch(93.7% 0.023 299.4)
-
Step 200
200
#DED3F3
oklch(88.6% 0.045 301.1)
-
Step 300
300
#C9B5EE
oklch(80.9% 0.082 300.6)
-
Step 400
400
#AE8CE5
oklch(70.6% 0.131 300.7)
-
Step 500
500
#9B6DDD
oklch(63.1% 0.166 300.7)
-
Step 600
600
#8752CB
oklch(55.7% 0.181 300.9)
-
Step 700
700
#7241AF
oklch(49% 0.169 300.8)
-
Step 800
800 (this color)
#643E96
oklch(45.2% 0.14 300.9)
-
Step 900
900
#4C3071
oklch(37.6% 0.109 301.2)
-
Step 950
950
#2C1D42
oklch(26.9% 0.068 300.6)
#643E96 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) | #155199 | 0.105 |
| Deuteranopia (no green cones) | #255194 | 0.096 |
| Tritanopia (no blue cones) | #5A5064 | 0.106 |
| Achromatopsia (no color) | #525252 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643E96
#643E96
oklch(45.2% 0.14 300.9)
- #4E5E00
#4E5E00
oklch(45.2% 0.108 120.5)
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 #643E96, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.025
- Blueberry #464196 ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.053
- Twilight #4E518B ΔE 0.063
- Bluey Purple #6241C7 ΔE 0.078
- Dusk #4E5481 ΔE 0.079
- Light Eggplant #894585 ΔE 0.082
- Blue With A Hint Of Purple #533CC6 ΔE 0.084
Use #643E96 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.