#643D7C
Closest named color: Rebecca Purple (#663399). oklch(43.4% 0.108 311.2), rgb(100, 61, 124).
Aa
White text reads best on this color (8.39:1).
About this color
#643D7C is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.108 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 0.055 away. White text reads best on it, at 8.39:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.108) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.50:1 |
| White text | 8.39:1 |
Values
| HEX | #643D7C |
| RGB | rgb(100, 61, 124) |
| HSL | hsl(277, 34%, 36%) |
| OKLCH | oklch(43.4% 0.108 311.2) |
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 #643D7C | 8.39:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #643D7C | 2.50:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #643D7C text on white | 8.39:1 | AAA | Lc 88.7 | Fine for body text |
| #643D7C text on black | 2.50:1 | 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
#F7F4FA
oklch(97.1% 0.009 308.4)
-
Step 100
100
#EEE7F3
oklch(93.7% 0.018 311.6)
-
Step 200
200
#E1D3EB
oklch(88.5% 0.036 311.4)
-
Step 300
300
#CEB6DF
oklch(81% 0.062 311.2)
-
Step 400
400
#B58ECF
oklch(70.6% 0.102 311.3)
-
Step 500
500
#A371C3
oklch(63.2% 0.13 311.2)
-
Step 600
600
#8E58AF
oklch(55.7% 0.141 311.3)
-
Step 700
700
#784796
oklch(49% 0.131 311.1)
-
Step 800
800 (this color)
#643D7C
oklch(43.4% 0.108 311.2)
-
Step 900
900
#503362
oklch(37.7% 0.085 311.4)
-
Step 950
950
#2F1E39
oklch(26.9% 0.053 312.1)
#643D7C 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) | #2E4B7E | 0.088 |
| Deuteranopia (no green cones) | #394E7A | 0.080 |
| Tritanopia (no blue cones) | #614756 | 0.076 |
| Achromatopsia (no color) | #4D4D4D | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643D7C
#643D7C
oklch(43.4% 0.108 311.2)
- #3B5C11
#3B5C11
oklch(43.3% 0.108 130.9)
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 #643D7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.057
- Twilight #4E518B ΔE 0.062
- Blueberry #464196 ΔE 0.067
- Dusk #4E5481 ΔE 0.068
- Light Eggplant #894585 ΔE 0.077
- Dusty Grape #545775 ΔE 0.078
- Brownish Purple #76424E ΔE 0.090
Use #643D7C 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.