#643C33
Closest named color: Purple Brown (#673A3F). oklch(40.2% 0.059 33.4), rgb(100, 60, 51).
Aa
White text reads best on this color (9.39:1).
About this color
#643C33 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.059 and its hue 33°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.022 away. White text reads best on it, at 9.39:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.059) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.23:1 |
| White text | 9.39:1 |
Values
| HEX | #643C33 |
| RGB | rgb(100, 60, 51) |
| HSL | hsl(11, 32%, 30%) |
| OKLCH | oklch(40.2% 0.059 33.4) |
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 #643C33 | 9.39:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #643C33 | 2.23:1 | Fails | Lc 12.4 | Not readable |
| #643C33 text on white | 9.39:1 | AAA | Lc 91.5 | Preferred for body text |
| #643C33 text on black | 2.23:1 | Fails | Lc -10.8 | 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
#DCB7AE
oklch(80.9% 0.045 33.9)
-
Step 400
400
#C99184
oklch(70.8% 0.071 33.5)
-
Step 500
500
#BA7565
oklch(63.2% 0.091 33.8)
-
Step 600
600
#A55C4D
oklch(55.6% 0.099 32.6)
-
Step 700
700
#8D4C3E
oklch(49.2% 0.091 33.2)
-
Step 800
800
#733E33
oklch(42.7% 0.077 32.7)
-
Step 900
900 (this color)
#643C33
oklch(40.2% 0.059 33.4)
-
Step 950
950
#37201A
oklch(27.2% 0.038 35.3)
#643C33 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 | 0.058 |
| Deuteranopia (no green cones) | #4F4A33 | 0.054 |
| Tritanopia (no blue cones) | #6C363A | 0.027 |
| Achromatopsia (no color) | #464646 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643C33
#643C33
oklch(40.2% 0.059 33.4)
- #19505B
#19505B
oklch(40.1% 0.059 213.5)
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 #643C33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.022
- Brownish Purple #76424E ΔE 0.056
- Mud Brown #60460F ΔE 0.059
- Chestnut #742802 ΔE 0.060
- Charcoal Grey #3C4142 ΔE 0.073
- Red Brown #8B2E16 ΔE 0.080
- Rust Brown #8B3103 ΔE 0.083
- Milk Chocolate #7F4E1E ΔE 0.084
Use #643C33 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.