#643D7F
Closest named color: Rebecca Purple (#663399). oklch(43.6% 0.112 309.8), rgb(100, 61, 127).
Aa
White text reads best on this color (8.34:1).
About this color
#643D7F is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.112 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 0.051 away. White text reads best on it, at 8.34:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.112) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.51:1 |
| White text | 8.34:1 |
Values
| HEX | #643D7F |
| RGB | rgb(100, 61, 127) |
| HSL | hsl(275, 35%, 37%) |
| OKLCH | oklch(43.6% 0.112 309.8) |
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 #643D7F | 8.34:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #643D7F | 2.51:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #643D7F text on white | 8.34:1 | AAA | Lc 88.6 | Fine for body text |
| #643D7F text on black | 2.51:1 | Fails | Lc -13.6 | 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
#EEE7F4
oklch(93.7% 0.019 309.8)
-
Step 200
200
#E0D3EC
oklch(88.5% 0.037 308.8)
-
Step 300
300
#CDB5E1
oklch(80.8% 0.066 309.5)
-
Step 400
400
#B48ED2
oklch(70.7% 0.105 309.4)
-
Step 500
500
#A270C6
oklch(63% 0.135 309.8)
-
Step 600
600
#8D57B2
oklch(55.6% 0.145 309.9)
-
Step 700
700
#784799
oklch(49.1% 0.135 309.9)
-
Step 800
800 (this color)
#643D7F
oklch(43.6% 0.112 309.8)
-
Step 900
900
#503364
oklch(37.8% 0.087 310.1)
-
Step 950
950
#2F1E3B
oklch(27.1% 0.056 310.1)
#643D7F 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) | #2C4C81 | 0.091 |
| Deuteranopia (no green cones) | #374E7D | 0.082 |
| Tritanopia (no blue cones) | #614858 | 0.079 |
| Achromatopsia (no color) | #4E4E4E | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643D7F
#643D7F
oklch(43.6% 0.112 309.8)
- #3C5D08
#3C5D08
oklch(43.6% 0.113 130)
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 #643D7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.055
- Twilight #4E518B ΔE 0.061
- Blueberry #464196 ΔE 0.064
- Dusk #4E5481 ΔE 0.069
- Light Eggplant #894585 ΔE 0.076
- Dusty Grape #545775 ΔE 0.080
- Brownish Purple #76424E ΔE 0.094
Use #643D7F 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.