#643A7D
Closest named color: Rebecca Purple (#663399). oklch(42.9% 0.115 311.4), rgb(100, 58, 125).
Aa
White text reads best on this color (8.59:1).
About this color
#643A7D 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 8.59:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.115) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.44:1 |
| White text | 8.59:1 |
Values
| HEX | #643A7D |
| RGB | rgb(100, 58, 125) |
| HSL | hsl(278, 37%, 36%) |
| OKLCH | oklch(42.9% 0.115 311.4) |
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 #643A7D | 8.59:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #643A7D | 2.44:1 | Fails | Lc 14.7 | Not readable |
| #643A7D text on white | 8.59:1 | AAA | Lc 89.3 | Fine for body text |
| #643A7D text on black | 2.44:1 | Fails | Lc -13.0 | 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
#CFB5E1
oklch(81% 0.067 311.4)
-
Step 400
400
#B78DD2
oklch(70.8% 0.108 311.6)
-
Step 500
500
#A46FC6
oklch(63.1% 0.138 311)
-
Step 600
600
#9055B2
oklch(55.6% 0.15 311.8)
-
Step 700
700
#7A4599
oklch(49.1% 0.139 311.5)
-
Step 800
800 (this color)
#643A7D
oklch(42.9% 0.115 311.4)
-
Step 900
900
#513264
oklch(37.7% 0.09 311.4)
-
Step 950
950
#2F1E3B
oklch(27.1% 0.056 310.1)
#643A7D 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) | #294A7F | 0.096 |
| Deuteranopia (no green cones) | #364D7B | 0.086 |
| Tritanopia (no blue cones) | #614556 | 0.079 |
| Achromatopsia (no color) | #4C4C4C | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643A7D
#643A7D
oklch(42.9% 0.115 311.4)
- #375C05
#375C05
oklch(43% 0.116 131.7)
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 #643A7D, 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 0.056
- Blueberry #464196 ΔE 0.067
- Twilight #4E518B ΔE 0.068
- Dusk #4E5481 ΔE 0.075
- Light Eggplant #894585 ΔE 0.080
- Dusty Grape #545775 ΔE 0.086
- Purple #800080 ΔE 0.090
Use #643A7D 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.