#643B51
Closest named color: Purple Brown (#673A3F). oklch(40.9% 0.066 347), rgb(100, 59, 81).
Aa
White text reads best on this color (9.18:1).
About this color
#643B51 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.066 and its hue 347°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.030 away. White text reads best on it, at 9.18:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.066) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.28:1 |
| White text | 9.18:1 |
Values
| HEX | #643B51 |
| RGB | rgb(100, 59, 81) |
| HSL | hsl(328, 26%, 31%) |
| OKLCH | oklch(40.9% 0.066 347) |
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 #643B51 | 9.18:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #643B51 | 2.28:1 | Fails | Lc 13.0 | Not readable |
| #643B51 text on white | 9.18:1 | AAA | Lc 91.0 | Preferred for body text |
| #643B51 text on black | 2.28:1 | Fails | Lc -11.3 | 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
#E4D4DC
oklch(88.5% 0.021 345.7)
-
Step 300
300
#D4B7C5
oklch(80.8% 0.038 347.3)
-
Step 400
400
#BE91A8
oklch(70.6% 0.062 346.7)
-
Step 500
500
#AD7693
oklch(63.1% 0.079 346.7)
-
Step 600
600
#985E7D
oklch(55.6% 0.086 347)
-
Step 700
700
#814E69
oklch(49.1% 0.078 347.3)
-
Step 800
800 (this color)
#643B51
oklch(40.9% 0.066 347)
-
Step 900
900
#563647
oklch(37.7% 0.052 346.8)
-
Step 950
950
#322029
oklch(27% 0.032 348)
#643B51 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) | #3E4452 | 0.070 |
| Deuteranopia (no green cones) | #484A50 | 0.064 |
| Tritanopia (no blue cones) | #693A43 | 0.024 |
| Achromatopsia (no color) | #484848 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643B51
#643B51
oklch(40.9% 0.066 347)
- #205543
#205543
oklch(40.8% 0.064 167.8)
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 #643B51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.030
- Brownish Purple #76424E ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.080
- Dusty Grape #545775 ΔE 0.086
- Dark Mauve #874C62 ΔE 0.087
- Velvet #750851 ΔE 0.093
- Grape Purple #5D1451 ΔE 0.093
- Onyx #343A40 ΔE 0.094
Use #643B51 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.