#643B33
Closest named color: Purple Brown (#673A3F). oklch(40% 0.06 31.8), rgb(100, 59, 51).
Aa
White text reads best on this color (9.47:1).
About this color
#643B33 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.060 and its hue 32°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.021 away. White text reads best on it, at 9.47:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.060) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.21:1 |
| White text | 9.47:1 |
Values
| HEX | #643B33 |
| RGB | rgb(100, 59, 51) |
| HSL | hsl(10, 32%, 30%) |
| OKLCH | oklch(40% 0.06 31.8) |
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 #643B33 | 9.47:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #643B33 | 2.21:1 | Fails | Lc 12.2 | Not readable |
| #643B33 text on white | 9.47:1 | AAA | Lc 91.8 | Preferred for body text |
| #643B33 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
#E9D4CF
oklch(88.6% 0.024 33.6)
-
Step 300
300
#DCB7AF
oklch(81% 0.044 32.3)
-
Step 400
400
#CA9085
oklch(70.7% 0.073 31)
-
Step 500
500
#BB7466
oklch(63.2% 0.093 31.8)
-
Step 600
600
#A65C4E
oklch(55.7% 0.1 31.7)
-
Step 700
700
#8E4B3E
oklch(49.1% 0.094 32.1)
-
Step 800
800
#733E34
oklch(42.7% 0.076 31.7)
-
Step 900
900 (this color)
#643B33
oklch(40% 0.06 31.8)
-
Step 950
950
#371F1B
oklch(27% 0.039 30)
#643B33 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) | #454132 | 0.059 |
| Deuteranopia (no green cones) | #4E4932 | 0.056 |
| Tritanopia (no blue cones) | #6C3539 | 0.026 |
| Achromatopsia (no color) | #464646 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643B33
#643B33
oklch(40% 0.06 31.8)
- #16505A
#16505A
oklch(39.9% 0.06 211.4)
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 #643B33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.021
- Brownish Purple #76424E ΔE 0.056
- Chestnut #742802 ΔE 0.059
- Mud Brown #60460F ΔE 0.061
- Charcoal Grey #3C4142 ΔE 0.073
- Red Brown #8B2E16 ΔE 0.080
- Rust Brown #8B3103 ΔE 0.083
- Reddy Brown #6E1005 ΔE 0.086
Use #643B33 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.