#643C42
Closest named color: Purple Brown (#673A3F). oklch(40.6% 0.057 10.2), rgb(100, 60, 66).
Aa
White text reads best on this color (9.26:1).
About this color
#643C42 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.057 and its hue 10°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.008 away. White text reads best on it, at 9.26:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.057) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.26:1 |
| White text | 9.26:1 |
Values
| HEX | #643C42 |
| RGB | rgb(100, 60, 66) |
| HSL | hsl(351, 25%, 31%) |
| OKLCH | oklch(40.6% 0.057 10.2) |
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 #643C42 | 9.26:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #643C42 | 2.26:1 | Fails | Lc 12.7 | Not readable |
| #643C42 text on white | 9.26:1 | AAA | Lc 91.2 | Preferred for body text |
| #643C42 text on black | 2.26:1 | Fails | Lc -11.1 | 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
#F8F4F5
oklch(97.1% 0.004 360)
-
Step 100
100
#F0E7E8
oklch(93.5% 0.01 9.5)
-
Step 200
200
#E5D4D6
oklch(88.4% 0.019 9.4)
-
Step 300
300
#D5B8BB
oklch(80.8% 0.034 10.8)
-
Step 400
400
#BF9399
oklch(70.6% 0.054 9.4)
-
Step 500
500
#AE7880
oklch(63% 0.068 9.4)
-
Step 600
600
#996169
oklch(55.6% 0.074 10.4)
-
Step 700
700
#835058
oklch(49.2% 0.069 9.7)
-
Step 800
800 (this color)
#643C42
oklch(40.6% 0.057 10.2)
-
Step 900
900
#56383C
oklch(37.7% 0.043 10.6)
-
Step 950
950
#332123
oklch(27.1% 0.028 11.8)
#643C42 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) | #434342 | 0.062 |
| Deuteranopia (no green cones) | #4D4A41 | 0.057 |
| Tritanopia (no blue cones) | #6B383E | 0.016 |
| Achromatopsia (no color) | #474747 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643C42
#643C42
oklch(40.6% 0.057 10.2)
- #1C5350
#1C5350
oklch(40.5% 0.057 190.1)
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 #643C42, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.008
- Brownish Purple #76424E ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.072
- Chestnut #742802 ΔE 0.076
- Mud Brown #60460F ΔE 0.080
- Onyx #343A40 ΔE 0.089
- Red Brown #8B2E16 ΔE 0.089
- Dark Mauve #874C62 ΔE 0.093
Use #643C42 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.