#643729
Closest named color: Purple Brown (#673A3F). oklch(39% 0.069 38), rgb(100, 55, 41).
Aa
White text reads best on this color (9.90:1).
About this color
#643729 is a dark, muted red. In OKLCH its lightness is 39%, its chroma 0.069 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.033 away. White text reads best on it, at 9.90:1.
| Hue family | Reds |
| Lightness | dark (39%) |
| Chroma | muted (0.069) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.12:1 |
| White text | 9.90:1 |
Values
| HEX | #643729 |
| RGB | rgb(100, 55, 41) |
| HSL | hsl(14, 42%, 28%) |
| OKLCH | oklch(39% 0.069 38) |
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 #643729 | 9.90:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #643729 | 2.12:1 | Fails | Lc 11.2 | Not readable |
| #643729 text on white | 9.90:1 | AAA | Lc 92.7 | Preferred for body text |
| #643729 text on black | 2.12:1 | Fails | Lc -9.7 | 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
#FAF4F2
oklch(97.1% 0.007 39.5)
-
Step 100
100
#F3E7E3
oklch(93.6% 0.014 39.4)
-
Step 200
200
#EBD3CC
oklch(88.5% 0.029 36.9)
-
Step 300
300
#DFB6A9
oklch(80.9% 0.051 38.3)
-
Step 400
400
#CE8F7B
oklch(70.7% 0.082 38.4)
-
Step 500
500
#C0725A
oklch(63.2% 0.105 37.9)
-
Step 600
600
#AB593F
oklch(55.6% 0.114 38.3)
-
Step 700
700
#924831
oklch(49% 0.106 38)
-
Step 800
800
#773C29
oklch(42.7% 0.088 38.5)
-
Step 900
900 (this color)
#643729
oklch(39% 0.069 38)
-
Step 950
950
#391F16
oklch(27.2% 0.044 39.8)
#643729 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) | #423D28 | 0.066 |
| Deuteranopia (no green cones) | #4D4728 | 0.062 |
| Tritanopia (no blue cones) | #6D2F34 | 0.035 |
| Achromatopsia (no color) | #434343 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643729
#643729
oklch(39% 0.069 38)
- #044D5D
#044D5D
oklch(38.9% 0.068 218.3)
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 #643729, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.033
- Chestnut #742802 ΔE 0.047
- Mud Brown #60460F ΔE 0.059
- Brownish Purple #76424E ΔE 0.069
- Reddy Brown #6E1005 ΔE 0.074
- Charcoal Grey #3C4142 ΔE 0.078
- Red Brown #8B2E16 ΔE 0.078
- Rust Brown #8B3103 ΔE 0.081
Use #643729 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.