#643C3C
Closest named color: Purple Brown (#673A3F). oklch(40.4% 0.057 19.8), rgb(100, 60, 60).
Aa
White text reads best on this color (9.31:1).
About this color
#643C3C is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.057 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.010 away. White text reads best on it, at 9.31:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.057) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.25:1 |
| White text | 9.31:1 |
Values
| HEX | #643C3C |
| RGB | rgb(100, 60, 60) |
| HSL | hsl(0, 25%, 31%) |
| OKLCH | oklch(40.4% 0.057 19.8) |
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 #643C3C | 9.31:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #643C3C | 2.25:1 | Fails | Lc 12.6 | Not readable |
| #643C3C text on white | 9.31:1 | AAA | Lc 91.4 | Preferred for body text |
| #643C3C text on black | 2.25:1 | Fails | Lc -11.0 | 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
#F8F4F4
oklch(97% 0.004 17.2)
-
Step 100
100
#F0E7E7
oklch(93.5% 0.01 17.3)
-
Step 200
200
#E5D5D4
oklch(88.6% 0.018 21.8)
-
Step 300
300
#D5B9B8
oklch(80.9% 0.032 20.3)
-
Step 400
400
#C09493
oklch(70.8% 0.053 20)
-
Step 500
500
#AF7979
oklch(63.1% 0.068 19.1)
-
Step 600
600
#9A6261
oklch(55.7% 0.073 20.8)
-
Step 700
700
#835151
oklch(49.2% 0.067 19.8)
-
Step 800
800 (this color)
#643C3C
oklch(40.4% 0.057 19.8)
-
Step 900
900
#573838
oklch(37.7% 0.045 19.4)
-
Step 950
950
#332121
oklch(27% 0.028 19.1)
#643C3C 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) | #44423C | 0.060 |
| Deuteranopia (no green cones) | #4E4A3B | 0.056 |
| Tritanopia (no blue cones) | #6B373C | 0.018 |
| Achromatopsia (no color) | #474747 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643C3C
#643C3C
oklch(40.4% 0.057 19.8)
- #1B5255
#1B5255
oklch(40.4% 0.057 200.3)
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 #643C3C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.010
- Brownish Purple #76424E ΔE 0.047
- Chestnut #742802 ΔE 0.069
- Mud Brown #60460F ΔE 0.071
- Charcoal Grey #3C4142 ΔE 0.072
- Red Brown #8B2E16 ΔE 0.085
- Onyx #343A40 ΔE 0.089
- Rust Brown #8B3103 ΔE 0.089
Use #643C3C 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.