#643D9D
Closest named color: Rebecca Purple (#663399). oklch(45.6% 0.15 299), rgb(100, 61, 157).
Aa
White text reads best on this color (7.78:1).
About this color
#643D9D is a medium-dark, vivid purple. In OKLCH its lightness is 46%, its chroma 0.150 and its hue 299°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.022 away. White text reads best on it, at 7.78:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.150) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.69:1 |
| White text | 7.78:1 |
Values
| HEX | #643D9D |
| RGB | rgb(100, 61, 157) |
| HSL | hsl(264, 44%, 43%) |
| OKLCH | oklch(45.6% 0.15 299) |
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 #643D9D | 7.78:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #643D9D | 2.69:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #643D9D text on white | 7.78:1 | AAA | Lc 86.6 | Fine for body text |
| #643D9D text on black | 2.69:1 | Fails | Lc -15.4 | 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
#ECE6F9
oklch(93.5% 0.026 300.3)
-
Step 200
200
#DDD3F6
oklch(88.6% 0.049 298.5)
-
Step 300
300
#C8B4F2
oklch(80.8% 0.089 299.2)
-
Step 400
400
#AD8BEB
oklch(70.6% 0.14 299.1)
-
Step 500
500
#9A6BE5
oklch(63.1% 0.179 299)
-
Step 600
600
#864FD3
oklch(55.7% 0.195 299.1)
-
Step 700
700
#713EB7
oklch(49% 0.182 298.8)
-
Step 800
800 (this color)
#643D9D
oklch(45.6% 0.15 299)
-
Step 900
900
#4B2F76
oklch(37.7% 0.117 298.8)
-
Step 950
950
#2C1C45
oklch(26.9% 0.075 299.4)
#643D9D 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) | #0052A0 | 0.112 |
| Deuteranopia (no green cones) | #1A519B | 0.103 |
| Tritanopia (no blue cones) | #575167 | 0.114 |
| Achromatopsia (no color) | #525252 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643D9D
#643D9D
oklch(45.6% 0.15 299)
- #515E00
#515E00
oklch(45.5% 0.106 118.6)
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 #643D9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.022
- Blueberry #464196 ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.058
- Bluey Purple #6241C7 ΔE 0.067
- Twilight #4E518B ΔE 0.069
- Blue With A Hint Of Purple #533CC6 ΔE 0.073
- Grape #7209B7 ΔE 0.080
- Blurple #5539CC ΔE 0.081
Use #643D9D 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.