#643A31
Closest named color: Purple Brown (#673A3F). oklch(39.7% 0.062 32.9), rgb(100, 58, 49).
Aa
White text reads best on this color (9.58:1).
About this color
#643A31 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.062 and its hue 33°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.023 away. White text reads best on it, at 9.58:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.062) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.19:1 |
| White text | 9.58:1 |
Values
| HEX | #643A31 |
| RGB | rgb(100, 58, 49) |
| HSL | hsl(11, 34%, 29%) |
| OKLCH | oklch(39.7% 0.062 32.9) |
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 #643A31 | 9.58:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #643A31 | 2.19:1 | Fails | Lc 11.9 | Not readable |
| #643A31 text on white | 9.58:1 | AAA | Lc 92.0 | Preferred for body text |
| #643A31 text on black | 2.19:1 | Fails | Lc -10.4 | 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
#FAF4F3
oklch(97.2% 0.007 28.8)
-
Step 100
100
#F3E7E4
oklch(93.7% 0.014 34.3)
-
Step 200
200
#EAD3CE
oklch(88.4% 0.027 32.2)
-
Step 300
300
#DDB6AE
oklch(80.8% 0.047 31.6)
-
Step 400
400
#CB9083
oklch(70.8% 0.075 32.8)
-
Step 500
500
#BC7364
oklch(63.1% 0.096 32.4)
-
Step 600
600
#A75B4B
oklch(55.6% 0.103 33)
-
Step 700
700
#8F4A3C
oklch(49.1% 0.097 32.7)
-
Step 800
800
#743D32
oklch(42.6% 0.08 32.4)
-
Step 900
900 (this color)
#643A31
oklch(39.7% 0.062 32.9)
-
Step 950
950
#371F1A
oklch(26.9% 0.039 32.5)
#643A31 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) | #444030 | 0.061 |
| Deuteranopia (no green cones) | #4E4830 | 0.056 |
| Tritanopia (no blue cones) | #6C3438 | 0.027 |
| Achromatopsia (no color) | #454545 | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643A31
#643A31
oklch(39.7% 0.062 32.9)
- #124F5B
#124F5B
oklch(39.6% 0.062 214.1)
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 #643A31, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.023
- Chestnut #742802 ΔE 0.056
- Brownish Purple #76424E ΔE 0.059
- Mud Brown #60460F ΔE 0.061
- Charcoal Grey #3C4142 ΔE 0.074
- Red Brown #8B2E16 ΔE 0.080
- Rust Brown #8B3103 ΔE 0.083
- Reddy Brown #6E1005 ΔE 0.083
Use #643A31 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.