#643B4E
Closest named color: Purple Brown (#673A3F). oklch(40.8% 0.064 351), rgb(100, 59, 78).
Aa
White text reads best on this color (9.22:1).
About this color
#643B4E is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.064 and its hue 351°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.025 away. White text reads best on it, at 9.22:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.064) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #643B4E |
| RGB | rgb(100, 59, 78) |
| HSL | hsl(332, 26%, 31%) |
| OKLCH | oklch(40.8% 0.064 351) |
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 #643B4E | 9.22:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #643B4E | 2.27:1 | Fails | Lc 12.9 | Not readable |
| #643B4E text on white | 9.22:1 | AAA | Lc 91.1 | Preferred for body text |
| #643B4E text on black | 2.27:1 | Fails | Lc -11.2 | 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
#F8F4F6
oklch(97.1% 0.005 345.3)
-
Step 100
100
#F0E7EB
oklch(93.6% 0.011 348.4)
-
Step 200
200
#E5D4DB
oklch(88.6% 0.021 350.6)
-
Step 300
300
#D5B7C3
oklch(80.9% 0.038 351.9)
-
Step 400
400
#BE92A5
oklch(70.7% 0.059 351)
-
Step 500
500
#AD768F
oklch(63% 0.076 350.7)
-
Step 600
600
#985F79
oklch(55.6% 0.082 351.2)
-
Step 700
700
#824E66
oklch(49.1% 0.077 351.1)
-
Step 800
800 (this color)
#643B4E
oklch(40.8% 0.064 351)
-
Step 900
900
#563745
oklch(37.8% 0.049 351)
-
Step 950
950
#322028
oklch(26.9% 0.031 351.1)
#643B4E 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) | #3F434F | 0.068 |
| Deuteranopia (no green cones) | #494A4D | 0.063 |
| Tritanopia (no blue cones) | #6A3A42 | 0.022 |
| Achromatopsia (no color) | #474747 | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643B4E
#643B4E
oklch(40.8% 0.064 351)
- #1E5545
#1E5545
oklch(40.8% 0.064 170.8)
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 #643B4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.025
- Brownish Purple #76424E ΔE 0.042
- Charcoal Grey #3C4142 ΔE 0.078
- Dark Mauve #874C62 ΔE 0.088
- Dusty Grape #545775 ΔE 0.088
- Onyx #343A40 ΔE 0.092
- Chestnut #742802 ΔE 0.092
- Velvet #750851 ΔE 0.094
Use #643B4E 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.