#643399
Closest named color: Rebecca Purple (#663399). oklch(43.8% 0.16 302.3), rgb(100, 51, 153).
Aa
White text reads best on this color (8.48:1).
About this color
#643399 is a dark, vivid purple. In OKLCH its lightness is 44%, its chroma 0.160 and its hue 302°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.004 away. White text reads best on it, at 8.48:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | vivid (0.160) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.47:1 |
| White text | 8.48:1 |
Values
| HEX | #643399 |
| RGB | rgb(100, 51, 153) |
| HSL | hsl(269, 50%, 40%) |
| OKLCH | oklch(43.8% 0.16 302.3) |
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 #643399 | 8.48:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #643399 | 2.47:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #643399 text on white | 8.48:1 | AAA | Lc 88.7 | Fine for body text |
| #643399 text on black | 2.47:1 | Fails | Lc -13.5 | Not readable |
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
#F7F4FD
oklch(97.2% 0.012 301.3)
-
Step 100
100
#EDE6F9
oklch(93.6% 0.026 302.6)
-
Step 200
200
#DFD2F6
oklch(88.5% 0.051 301.8)
-
Step 300
300
#CCB2F3
oklch(80.8% 0.094 302.7)
-
Step 400
400
#B388ED
oklch(70.8% 0.149 302.4)
-
Step 500
500
#A166E7
oklch(63.2% 0.19 302.4)
-
Step 600
600
#8C48D5
oklch(55.6% 0.207 302.2)
-
Step 700
700
#7738B9
oklch(49.1% 0.193 302)
-
Step 800
800 (this color)
#643399
oklch(43.8% 0.16 302.3)
-
Step 900
900
#4F2C77
oklch(37.7% 0.124 302.3)
-
Step 950
950
#2E1B46
oklch(27.1% 0.079 301.8)
#643399 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) | #004C9C | 0.121 |
| Deuteranopia (no green cones) | #094C97 | 0.120 |
| Tritanopia (no blue cones) | #594A61 | 0.119 |
| Achromatopsia (no color) | #4D4D4D | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643399
#643399
oklch(43.8% 0.16 302.3)
- #485A00
#485A00
oklch(43.7% 0.106 122.1)
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 #643399, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.004
- Dark Slate Blue #483D8B ΔE 0.058
- Blueberry #464196 ΔE 0.059
- Grape #7209B7 ΔE 0.069
- Chrysanthemum #560BAD ΔE 0.071
- Bluey Purple #6241C7 ΔE 0.078
- Blue With A Hint Of Purple #533CC6 ΔE 0.081
- Twilight #4E518B ΔE 0.085
Use #643399 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.