#643F66
Closest named color: Brownish Purple (#76424E). oklch(42.6% 0.078 325), rgb(100, 63, 102).
Aa
White text reads best on this color (8.58:1).
About this color
#643F66 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.078 and its hue 325°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Brownish Purple (#76424E), ΔE 0.056 away. White text reads best on it, at 8.58:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.078) |
| Temperature | in between |
| Nearest name | Brownish Purple (#76424E) |
| Black text | 2.44:1 |
| White text | 8.58:1 |
Values
| HEX | #643F66 |
| RGB | rgb(100, 63, 102) |
| HSL | hsl(297, 24%, 32%) |
| OKLCH | oklch(42.6% 0.078 325) |
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 #643F66 | 8.58:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #643F66 | 2.44:1 | Fails | Lc 14.6 | Not readable |
| #643F66 text on white | 8.58:1 | AAA | Lc 89.4 | Fine for body text |
| #643F66 text on black | 2.44:1 | Fails | Lc -12.9 | 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
#F8F4F8
oklch(97.1% 0.007 325.6)
-
Step 100
100
#EFE7EF
oklch(93.7% 0.014 325.7)
-
Step 200
200
#E2D4E2
oklch(88.5% 0.024 325.8)
-
Step 300
300
#D0B7D1
oklch(80.9% 0.045 324.8)
-
Step 400
400
#B891BA
oklch(70.6% 0.073 324.7)
-
Step 500
500
#A676A8
oklch(63.1% 0.092 325.3)
-
Step 600
600
#915E94
oklch(55.7% 0.101 324.9)
-
Step 700
700
#7B4D7E
oklch(49.1% 0.094 324.7)
-
Step 800
800 (this color)
#643F66
oklch(42.6% 0.078 325)
-
Step 900
900
#523653
oklch(37.7% 0.06 325.5)
-
Step 950
950
#302031
oklch(27.1% 0.038 324.6)
#643F66 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) | #3C4967 | 0.070 |
| Deuteranopia (no green cones) | #454E65 | 0.065 |
| Tritanopia (no blue cones) | #66434E | 0.046 |
| Achromatopsia (no color) | #4C4C4C | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643F66
#643F66
oklch(42.6% 0.078 325)
- #315A33
#315A33
oklch(42.6% 0.078 145.1)
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 #643F66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brownish Purple #76424E ΔE 0.056
- Purple Brown #673A3F ΔE 0.063
- Dusty Grape #545775 ΔE 0.069
- Dusk #4E5481 ΔE 0.071
- Twilight #4E518B ΔE 0.076
- Dark Mauve #874C62 ΔE 0.081
- Dark Slate Blue #483D8B ΔE 0.082
- Light Eggplant #894585 ΔE 0.088
Use #643F66 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.