#643FA3
Closest named color: Rebecca Purple (#663399). oklch(46.3% 0.155 297), rgb(100, 63, 163).
Aa
White text reads best on this color (7.54:1).
About this color
#643FA3 is a medium-dark, vivid purple. In OKLCH its lightness is 46%, its chroma 0.155 and its hue 297°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.029 away. White text reads best on it, at 7.54:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.155) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.78:1 |
| White text | 7.54:1 |
Values
| HEX | #643FA3 |
| RGB | rgb(100, 63, 163) |
| HSL | hsl(262, 44%, 44%) |
| OKLCH | oklch(46.3% 0.155 297) |
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 #643FA3 | 7.54:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #643FA3 | 2.78:1 | Fails | Lc 18.2 | Dividers and decoration only |
| #643FA3 text on white | 7.54:1 | AAA | Lc 85.8 | Fine for body text |
| #643FA3 text on black | 2.78:1 | Fails | Lc -16.2 | 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 700.
-
Step 50
50
#F6F4FC
oklch(97.1% 0.011 297.6)
-
Step 100
100
#EBE7F7
oklch(93.6% 0.022 297.4)
-
Step 200
200
#DBD4F2
oklch(88.5% 0.041 296.2)
-
Step 300
300
#C5B7EC
oklch(80.9% 0.075 296.8)
-
Step 400
400
#A990E2
oklch(70.7% 0.12 297.3)
-
Step 500
500
#9472DA
oklch(63.1% 0.154 296.8)
-
Step 600
600
#7F58C7
oklch(55.5% 0.166 296.8)
-
Step 700
700 (this color)
#643FA3
oklch(46.3% 0.155 297)
-
Step 800
800
#583B8B
oklch(42.7% 0.128 297.4)
-
Step 900
900
#48346F
oklch(37.8% 0.099 297.1)
-
Step 950
950
#2A1F41
oklch(27% 0.062 297)
#643FA3 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) | #0055A6 | 0.110 |
| Deuteranopia (no green cones) | #1253A1 | 0.105 |
| Tritanopia (no blue cones) | #55556B | 0.120 |
| Achromatopsia (no color) | #545454 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643FA3
#643FA3
oklch(46.3% 0.155 297)
- #556000
#556000
oklch(46.3% 0.107 117.2)
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 #643FA3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.029
- Blueberry #464196 ΔE 0.055
- Bluey Purple #6241C7 ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.063
- Blue With A Hint Of Purple #533CC6 ΔE 0.065
- Twilight #4E518B ΔE 0.071
- Blurple #5539CC ΔE 0.073
- Iris #6258C4 ΔE 0.075
Use #643FA3 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.