#643A36
Closest named color: Purple Brown (#673A3F). oklch(39.8% 0.06 26), rgb(100, 58, 54).
Aa
White text reads best on this color (9.54:1).
About this color
#643A36 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.060 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.016 away. White text reads best on it, at 9.54:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.060) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.20:1 |
| White text | 9.54:1 |
Values
| HEX | #643A36 |
| RGB | rgb(100, 58, 54) |
| HSL | hsl(5, 30%, 30%) |
| OKLCH | oklch(39.8% 0.06 26) |
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 #643A36 | 9.54:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #643A36 | 2.20:1 | Fails | Lc 12.0 | Not readable |
| #643A36 text on white | 9.54:1 | AAA | Lc 91.9 | Preferred for body text |
| #643A36 text on black | 2.20:1 | Fails | Lc -10.5 | 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 900.
-
Step 50
50
#F9F4F3
oklch(97.1% 0.006 31.1)
-
Step 100
100
#F3E7E5
oklch(93.7% 0.013 28.9)
-
Step 200
200
#E9D3D0
oklch(88.4% 0.025 26.9)
-
Step 300
300
#DDB6B1
oklch(80.9% 0.046 26.7)
-
Step 400
400
#CA8F89
oklch(70.6% 0.073 25.6)
-
Step 500
500
#BB736C
oklch(63.1% 0.092 26)
-
Step 600
600
#A65A54
oklch(55.5% 0.101 25.5)
-
Step 700
700
#8E4A44
oklch(49.1% 0.093 26.3)
-
Step 800
800
#743D38
oklch(42.8% 0.078 26.3)
-
Step 900
900 (this color)
#643A36
oklch(39.8% 0.06 26)
-
Step 950
950
#371F1D
oklch(27% 0.038 25)
#643A36 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) | #434036 | 0.062 |
| Deuteranopia (no green cones) | #4D4935 | 0.059 |
| Tritanopia (no blue cones) | #6C3439 | 0.023 |
| Achromatopsia (no color) | #454545 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643A36
#643A36
oklch(39.8% 0.06 26)
- #135057
#135057
oklch(39.7% 0.06 206.3)
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 #643A36, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.016
- Brownish Purple #76424E ΔE 0.054
- Chestnut #742802 ΔE 0.061
- Mud Brown #60460F ΔE 0.067
- Charcoal Grey #3C4142 ΔE 0.073
- Red Brown #8B2E16 ΔE 0.082
- Reddy Brown #6E1005 ΔE 0.085
- Rust Brown #8B3103 ΔE 0.086
Use #643A36 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.