#643B31
Closest named color: Purple Brown (#673A3F). oklch(39.9% 0.061 34.5), rgb(100, 59, 49).
Aa
White text reads best on this color (9.49:1).
About this color
#643B31 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.061 and its hue 34°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.024 away. White text reads best on it, at 9.49:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.061) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.21:1 |
| White text | 9.49:1 |
Values
| HEX | #643B31 |
| RGB | rgb(100, 59, 49) |
| HSL | hsl(12, 34%, 29%) |
| OKLCH | oklch(39.9% 0.061 34.5) |
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 #643B31 | 9.49:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #643B31 | 2.21:1 | Fails | Lc 12.2 | Not readable |
| #643B31 text on white | 9.49:1 | AAA | Lc 91.8 | Preferred for body text |
| #643B31 text on black | 2.21:1 | Fails | Lc -10.6 | 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
#F2E7E4
oklch(93.6% 0.013 35.7)
-
Step 200
200
#E9D4CE
oklch(88.5% 0.025 36.5)
-
Step 300
300
#DCB7AD
oklch(80.9% 0.045 35.6)
-
Step 400
400
#CA9082
oklch(70.6% 0.074 34)
-
Step 500
500
#BB7463
oklch(63.1% 0.094 34.2)
-
Step 600
600
#A65C4A
oklch(55.6% 0.101 34.6)
-
Step 700
700
#8E4B3B
oklch(49.1% 0.095 34.5)
-
Step 800
800
#733E31
oklch(42.6% 0.078 34.7)
-
Step 900
900 (this color)
#643B31
oklch(39.9% 0.061 34.5)
-
Step 950
950
#371F1A
oklch(26.9% 0.039 32.5)
#643B31 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) | #454030 | 0.059 |
| Deuteranopia (no green cones) | #4F4930 | 0.055 |
| Tritanopia (no blue cones) | #6C3538 | 0.027 |
| Achromatopsia (no color) | #464646 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643B31
#643B31
oklch(39.9% 0.061 34.5)
- #16505C
#16505C
oklch(40% 0.061 214.5)
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 #643B31, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.024
- Chestnut #742802 ΔE 0.057
- Mud Brown #60460F ΔE 0.058
- Brownish Purple #76424E ΔE 0.058
- Charcoal Grey #3C4142 ΔE 0.073
- Red Brown #8B2E16 ΔE 0.080
- Rust Brown #8B3103 ΔE 0.082
- Reddy Brown #6E1005 ΔE 0.085
Use #643B31 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.