#643944
Closest named color: Purple Brown (#673A3F). oklch(40.1% 0.063 3.8), rgb(100, 57, 68).
Aa
White text reads best on this color (9.49:1).
About this color
#643944 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.063 and its hue 4°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.011 away. White text reads best on it, at 9.49:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.063) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.21:1 |
| White text | 9.49:1 |
Values
| HEX | #643944 |
| RGB | rgb(100, 57, 68) |
| HSL | hsl(345, 27%, 31%) |
| OKLCH | oklch(40.1% 0.063 3.8) |
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 #643944 | 9.49:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #643944 | 2.21:1 | Fails | Lc 12.2 | Not readable |
| #643944 text on white | 9.49:1 | AAA | Lc 91.8 | Preferred for body text |
| #643944 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
#F9F4F5
oklch(97.1% 0.006 3.3)
-
Step 100
100
#F2E6E9
oklch(93.5% 0.014 0.3)
-
Step 200
200
#E9D2D7
oklch(88.4% 0.026 2.8)
-
Step 300
300
#DCB5BD
oklch(81% 0.046 4.4)
-
Step 400
400
#C98D9B
oklch(70.6% 0.075 3.8)
-
Step 500
500
#BA7083
oklch(63.1% 0.096 3.6)
-
Step 600
600
#A5576C
oklch(55.5% 0.105 3.9)
-
Step 700
700
#8D475A
oklch(49% 0.097 4)
-
Step 800
800
#733B4A
oklch(42.8% 0.08 4)
-
Step 900
900 (this color)
#643944
oklch(40.1% 0.063 3.8)
-
Step 950
950
#371E24
oklch(27% 0.04 4.6)
#643944 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) | #404144 | 0.068 |
| Deuteranopia (no green cones) | #4A4943 | 0.064 |
| Tritanopia (no blue cones) | #6B363D | 0.017 |
| Achromatopsia (no color) | #464646 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643944
#643944
oklch(40.1% 0.063 3.8)
- #15534B
#15534B
oklch(40.1% 0.063 182.7)
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 #643944, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.011
- Brownish Purple #76424E ΔE 0.046
- Charcoal Grey #3C4142 ΔE 0.075
- Chestnut #742802 ΔE 0.078
- Onyx #343A40 ΔE 0.089
- Mud Brown #60460F ΔE 0.089
- Wine Red #7B0323 ΔE 0.091
- Bordeaux #7B002C ΔE 0.092
Use #643944 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.