#643B7E
Closest named color: Rebecca Purple (#663399). oklch(43.2% 0.115 310.7), rgb(100, 59, 126).
Aa
White text reads best on this color (8.50:1).
About this color
#643B7E is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.115 and its hue 311°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.050 away. White text reads best on it, at 8.50:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.115) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.46:1 |
| White text | 8.50:1 |
Values
| HEX | #643B7E |
| RGB | rgb(100, 59, 126) |
| HSL | hsl(277, 36%, 36%) |
| OKLCH | oklch(43.2% 0.115 310.7) |
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 #643B7E | 8.50:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #643B7E | 2.46:1 | Fails | Lc 15.0 | Not readable |
| #643B7E text on white | 8.50:1 | AAA | Lc 89.0 | Fine for body text |
| #643B7E text on black | 2.46:1 | Fails | Lc -13.2 | 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
#F7F4FA
oklch(97.1% 0.009 308.4)
-
Step 100
100
#EEE6F4
oklch(93.5% 0.021 311.1)
-
Step 200
200
#E1D3EC
oklch(88.6% 0.037 310.5)
-
Step 300
300
#CEB5E1
oklch(80.9% 0.067 310.4)
-
Step 400
400
#B68DD2
oklch(70.7% 0.108 310.9)
-
Step 500
500
#A46FC6
oklch(63.1% 0.138 311)
-
Step 600
600
#8F56B3
oklch(55.7% 0.149 310.7)
-
Step 700
700
#79469A
oklch(49.2% 0.138 310.3)
-
Step 800
800 (this color)
#643B7E
oklch(43.2% 0.115 310.7)
-
Step 900
900
#503264
oklch(37.6% 0.089 310.4)
-
Step 950
950
#2F1E3B
oklch(27.1% 0.056 310.1)
#643B7E 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) | #2A4B80 | 0.094 |
| Deuteranopia (no green cones) | #364D7C | 0.085 |
| Tritanopia (no blue cones) | #614657 | 0.079 |
| Achromatopsia (no color) | #4D4D4D | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643B7E
#643B7E
oklch(43.2% 0.115 310.7)
- #395C05
#395C05
oklch(43.2% 0.115 130.9)
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 #643B7E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.055
- Twilight #4E518B ΔE 0.065
- Blueberry #464196 ΔE 0.066
- Dusk #4E5481 ΔE 0.073
- Light Eggplant #894585 ΔE 0.078
- Dusty Grape #545775 ΔE 0.084
- Purple #800080 ΔE 0.092
Use #643B7E 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.