#643AA0
Closest named color: Rebecca Purple (#663399). oklch(45.3% 0.158 298.9), rgb(100, 58, 160).
Aa
White text reads best on this color (7.91:1).
About this color
#643AA0 is a medium-dark, vivid purple. In OKLCH its lightness is 45%, its chroma 0.158 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 0.018 away. White text reads best on it, at 7.91:1.
| Hue family | Purples |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.158) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.65:1 |
| White text | 7.91:1 |
Values
| HEX | #643AA0 |
| RGB | rgb(100, 58, 160) |
| HSL | hsl(265, 47%, 43%) |
| OKLCH | oklch(45.3% 0.158 298.9) |
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 #643AA0 | 7.91:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #643AA0 | 2.65:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #643AA0 text on white | 7.91:1 | AAA | Lc 87.0 | Fine for body text |
| #643AA0 text on black | 2.65:1 | Fails | Lc -15.1 | 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
#F6F4FD
oklch(97.1% 0.012 296.4)
-
Step 100
100
#ECE6FA
oklch(93.6% 0.027 299.5)
-
Step 200
200
#DDD2F7
oklch(88.4% 0.052 298.9)
-
Step 300
300
#C8B4F5
oklch(80.9% 0.093 298.4)
-
Step 400
400
#AE8AEF
oklch(70.8% 0.147 299)
-
Step 500
500
#9B68EA
oklch(63.1% 0.19 299)
-
Step 600
600
#874BD8
oklch(55.6% 0.206 299.1)
-
Step 700
700
#723BBB
oklch(49.1% 0.191 298.8)
-
Step 800
800 (this color)
#643AA0
oklch(45.3% 0.158 298.9)
-
Step 900
900
#4C2E79
oklch(37.8% 0.123 298.8)
-
Step 950
950
#2C1C47
oklch(27.1% 0.078 298.2)
#643AA0 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) | #0051A3 | 0.114 |
| Deuteranopia (no green cones) | #0A509E | 0.112 |
| Tritanopia (no blue cones) | #565167 | 0.122 |
| Achromatopsia (no color) | #515151 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643AA0
#643AA0
oklch(45.3% 0.158 298.9)
- #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 #643AA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.018
- Blueberry #464196 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.060
- Bluey Purple #6241C7 ΔE 0.064
- Blue With A Hint Of Purple #533CC6 ΔE 0.069
- Grape #7209B7 ΔE 0.072
- Blurple #5539CC ΔE 0.076
- Twilight #4E518B ΔE 0.077
Use #643AA0 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.