#643C38
Closest named color: Purple Brown (#673A3F). oklch(40.3% 0.057 26.1), rgb(100, 60, 56).
Aa
White text reads best on this color (9.35:1).
About this color
#643C38 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.057 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.015 away. White text reads best on it, at 9.35:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.057) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.24:1 |
| White text | 9.35:1 |
Values
| HEX | #643C38 |
| RGB | rgb(100, 60, 56) |
| HSL | hsl(5, 28%, 31%) |
| OKLCH | oklch(40.3% 0.057 26.1) |
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 #643C38 | 9.35:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #643C38 | 2.24:1 | Fails | Lc 12.5 | Not readable |
| #643C38 text on white | 9.35:1 | AAA | Lc 91.4 | Preferred for body text |
| #643C38 text on black | 2.24:1 | Fails | Lc -10.9 | 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
#F0E7E6
oklch(93.5% 0.01 25.1)
-
Step 200
200
#E5D5D3
oklch(88.5% 0.018 26.1)
-
Step 300
300
#D6B9B5
oklch(81% 0.034 27.2)
-
Step 400
400
#C0948F
oklch(70.6% 0.054 26)
-
Step 500
500
#AF7A74
oklch(63.2% 0.068 26.3)
-
Step 600
600
#9A625C
oklch(55.5% 0.074 26.4)
-
Step 700
700
#84514C
oklch(49.2% 0.07 26)
-
Step 800
800 (this color)
#643C38
oklch(40.3% 0.057 26.1)
-
Step 900
900
#573835
oklch(37.6% 0.045 25.5)
-
Step 950
950
#33211F
oklch(27% 0.028 26.2)
#643C38 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) | #454238 | 0.058 |
| Deuteranopia (no green cones) | #4E4A37 | 0.056 |
| Tritanopia (no blue cones) | #6C373B | 0.021 |
| Achromatopsia (no color) | #474747 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643C38
#643C38
oklch(40.3% 0.057 26.1)
- #1A5158
#1A5158
oklch(40.2% 0.057 207)
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 #643C38, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.015
- Brownish Purple #76424E ΔE 0.051
- Chestnut #742802 ΔE 0.064
- Mud Brown #60460F ΔE 0.065
- Charcoal Grey #3C4142 ΔE 0.072
- Red Brown #8B2E16 ΔE 0.083
- Rust Brown #8B3103 ΔE 0.086
- Milk Chocolate #7F4E1E ΔE 0.088
Use #643C38 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.