#643D9C
Closest named color: Rebecca Purple (#663399). oklch(45.5% 0.149 299.3), rgb(100, 61, 156).
Aa
White text reads best on this color (7.80:1).
About this color
#643D9C is a medium-dark, vivid purple. In OKLCH its lightness is 45%, its chroma 0.149 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 0.021 away. White text reads best on it, at 7.80:1.
| Hue family | Purples |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.149) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.68:1 |
| White text | 7.80:1 |
Values
| HEX | #643D9C |
| RGB | rgb(100, 61, 156) |
| HSL | hsl(265, 44%, 43%) |
| OKLCH | oklch(45.5% 0.149 299.3) |
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 #643D9C | 7.80:1 | AAA | Lc -91.5 | Preferred for body text |
| Black text on #643D9C | 2.68:1 | Fails | Lc 17.3 | Dividers and decoration only |
| #643D9C text on white | 7.80:1 | AAA | Lc 86.7 | Fine for body text |
| #643D9C text on black | 2.68:1 | 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
#DDD3F5
oklch(88.5% 0.047 298.9)
-
Step 300
300
#C8B4F1
oklch(80.8% 0.087 299.5)
-
Step 400
400
#AD8BEB
oklch(70.6% 0.14 299.1)
-
Step 500
500
#9A6BE4
oklch(63.1% 0.178 299.2)
-
Step 600
600
#864FD2
oklch(55.6% 0.194 299.4)
-
Step 700
700
#723FB6
oklch(49.2% 0.18 299.4)
-
Step 800
800 (this color)
#643D9C
oklch(45.5% 0.149 299.3)
-
Step 900
900
#4B2F75
oklch(37.6% 0.116 299.2)
-
Step 950
950
#2C1C45
oklch(26.9% 0.075 299.4)
#643D9C 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) | #01529F | 0.112 |
| Deuteranopia (no green cones) | #1B519A | 0.103 |
| Tritanopia (no blue cones) | #585166 | 0.114 |
| Achromatopsia (no color) | #525252 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643D9C
#643D9C
oklch(45.5% 0.149 299.3)
- #505E00
#505E00
oklch(45.4% 0.107 119.3)
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 #643D9C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.021
- Blueberry #464196 ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.057
- Twilight #4E518B ΔE 0.069
- Bluey Purple #6241C7 ΔE 0.069
- Blue With A Hint Of Purple #533CC6 ΔE 0.075
- Grape #7209B7 ΔE 0.081
- Blurple #5539CC ΔE 0.083
Use #643D9C 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.