#643597
Closest named color: Rebecca Purple (#663399). oklch(43.9% 0.155 302.5), rgb(100, 53, 151).
Aa
White text reads best on this color (8.40:1).
About this color
#643597 is a dark, vivid purple. In OKLCH its lightness is 44%, its chroma 0.155 and its hue 303°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.006 away. White text reads best on it, at 8.40:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | vivid (0.155) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.49:1 |
| White text | 8.40:1 |
Values
| HEX | #643597 |
| RGB | rgb(100, 53, 151) |
| HSL | hsl(269, 48%, 40%) |
| OKLCH | oklch(43.9% 0.155 302.5) |
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 #643597 | 8.40:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #643597 | 2.49:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #643597 text on white | 8.40:1 | AAA | Lc 88.5 | Fine for body text |
| #643597 text on black | 2.49:1 | Fails | Lc -13.7 | 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
#F7F4FC
oklch(97.2% 0.011 303.1)
-
Step 100
100
#EDE6F9
oklch(93.6% 0.026 302.6)
-
Step 200
200
#DFD2F5
oklch(88.5% 0.049 302.3)
-
Step 300
300
#CCB3F1
oklch(80.9% 0.09 302.9)
-
Step 400
400
#B289EB
oklch(70.8% 0.144 302.1)
-
Step 500
500
#A067E4
oklch(63.1% 0.185 302.5)
-
Step 600
600
#8C4AD2
oklch(55.6% 0.201 302.6)
-
Step 700
700
#773AB6
oklch(49.1% 0.187 302.5)
-
Step 800
800 (this color)
#643597
oklch(43.9% 0.155 302.5)
-
Step 900
900
#4F2D75
oklch(37.7% 0.12 302.8)
-
Step 950
950
#2E1B45
oklch(27% 0.077 302.4)
#643597 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) | #004D9A | 0.120 |
| Deuteranopia (no green cones) | #144D95 | 0.114 |
| Tritanopia (no blue cones) | #5A4A61 | 0.114 |
| Achromatopsia (no color) | #4D4D4D | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643597
#643597
oklch(43.9% 0.155 302.5)
- #485B00
#485B00
oklch(43.9% 0.107 122.6)
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 #643597, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.006
- Dark Slate Blue #483D8B ΔE 0.056
- Blueberry #464196 ΔE 0.057
- Grape #7209B7 ΔE 0.074
- Chrysanthemum #560BAD ΔE 0.075
- Twilight #4E518B ΔE 0.080
- Bluey Purple #6241C7 ΔE 0.080
- Blue With A Hint Of Purple #533CC6 ΔE 0.083
Use #643597 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.