#643A81
Closest named color: Rebecca Purple (#663399). oklch(43.2% 0.12 309.6), rgb(100, 58, 129).
Aa
White text reads best on this color (8.52:1).
About this color
#643A81 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.120 and its hue 310°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.044 away. White text reads best on it, at 8.52:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.120) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.46:1 |
| White text | 8.52:1 |
Values
| HEX | #643A81 |
| RGB | rgb(100, 58, 129) |
| HSL | hsl(275, 38%, 37%) |
| OKLCH | oklch(43.2% 0.12 309.6) |
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 #643A81 | 8.52:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #643A81 | 2.46:1 | Fails | Lc 15.0 | Not readable |
| #643A81 text on white | 8.52:1 | AAA | Lc 89.0 | Fine for body text |
| #643A81 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
#E1D3ED
oklch(88.6% 0.038 309.6)
-
Step 300
300
#CEB5E3
oklch(80.9% 0.069 309.4)
-
Step 400
400
#B68DD5
oklch(70.8% 0.111 309.8)
-
Step 500
500
#A36ECA
oklch(63% 0.144 309.4)
-
Step 600
600
#8F54B7
oklch(55.6% 0.157 309.7)
-
Step 700
700
#79449D
oklch(49% 0.145 309.6)
-
Step 800
800 (this color)
#643A81
oklch(43.2% 0.12 309.6)
-
Step 900
900
#503166
oklch(37.5% 0.094 309.6)
-
Step 950
950
#2F1D3C
oklch(26.9% 0.06 309.7)
#643A81 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) | #264B83 | 0.099 |
| Deuteranopia (no green cones) | #334D7F | 0.089 |
| Tritanopia (no blue cones) | #604658 | 0.083 |
| Achromatopsia (no color) | #4C4C4C | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643A81
#643A81
oklch(43.2% 0.12 309.6)
- #3B5C00
#3B5C00
oklch(43.3% 0.116 129.6)
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 #643A81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.044
- Dark Slate Blue #483D8B ΔE 0.053
- Blueberry #464196 ΔE 0.063
- Twilight #4E518B ΔE 0.067
- Dusk #4E5481 ΔE 0.076
- Light Eggplant #894585 ΔE 0.079
- Dusty Grape #545775 ΔE 0.088
- Purple #800080 ΔE 0.089
Use #643A81 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.