#643D3E
Closest named color: Purple Brown (#673A3F). oklch(40.7% 0.055 18.1), rgb(100, 61, 62).
Aa
White text reads best on this color (9.21:1).
About this color
#643D3E is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.055 and its hue 18°. 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 9.21:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.055) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.27:1 |
| White text | 9.21:1 |
Values
| HEX | #643D3E |
| RGB | rgb(100, 61, 62) |
| HSL | hsl(358, 24%, 32%) |
| OKLCH | oklch(40.7% 0.055 18.1) |
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 #643D3E | 9.21:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #643D3E | 2.27:1 | Fails | Lc 12.9 | Not readable |
| #643D3E text on white | 9.21:1 | AAA | Lc 91.1 | Preferred for body text |
| #643D3E 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
#F8F4F4
oklch(97% 0.004 17.2)
-
Step 100
100
#F0E7E7
oklch(93.5% 0.01 17.3)
-
Step 200
200
#E5D5D5
oklch(88.6% 0.018 17.5)
-
Step 300
300
#D5B9B9
oklch(81% 0.032 17.8)
-
Step 400
400
#BF9494
oklch(70.7% 0.052 18.5)
-
Step 500
500
#AE7A7A
oklch(63.2% 0.065 19)
-
Step 600
600
#996263
oklch(55.6% 0.072 18.4)
-
Step 700
700
#825152
oklch(49.1% 0.066 18.4)
-
Step 800
800 (this color)
#643D3E
oklch(40.7% 0.055 18.1)
-
Step 900
900
#563839
oklch(37.6% 0.043 17.1)
-
Step 950
950
#332121
oklch(27% 0.028 19.1)
#643D3E 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) | #45433E | 0.058 |
| Deuteranopia (no green cones) | #4E4A3D | 0.054 |
| Tritanopia (no blue cones) | #6B393E | 0.016 |
| Achromatopsia (no color) | #484848 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643D3E
#643D3E
oklch(40.7% 0.055 18.1)
- #1E5354
#1E5354
oklch(40.8% 0.055 196.9)
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 #643D3E, 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 0.045
- Charcoal Grey #3C4142 ΔE 0.071
- Chestnut #742802 ΔE 0.072
- Mud Brown #60460F ΔE 0.072
- Red Brown #8B2E16 ΔE 0.086
- Onyx #343A40 ΔE 0.089
- Milk Chocolate #7F4E1E ΔE 0.090
Use #643D3E 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.