#643A41
Closest named color: Purple Brown (#673A3F). oklch(40.2% 0.06 9.3), rgb(100, 58, 65).
Aa
White text reads best on this color (9.44:1).
About this color
#643A41 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.060 and its hue 9°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.007 away. White text reads best on it, at 9.44:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.060) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.22:1 |
| White text | 9.44:1 |
Values
| HEX | #643A41 |
| RGB | rgb(100, 58, 65) |
| HSL | hsl(350, 27%, 31%) |
| OKLCH | oklch(40.2% 0.06 9.3) |
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 #643A41 | 9.44:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #643A41 | 2.22:1 | Fails | Lc 12.3 | Not readable |
| #643A41 text on white | 9.44:1 | AAA | Lc 91.7 | Preferred for body text |
| #643A41 text on black | 2.22:1 | Fails | Lc -10.7 | 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
#F9F4F4
oklch(97.1% 0.005 17.2)
-
Step 100
100
#F2E6E8
oklch(93.5% 0.013 5.8)
-
Step 200
200
#E9D3D5
oklch(88.5% 0.025 11.3)
-
Step 300
300
#DCB5BA
oklch(80.9% 0.046 9.5)
-
Step 400
400
#C98E97
oklch(70.7% 0.073 9)
-
Step 500
500
#BA717D
oklch(63.1% 0.093 9.4)
-
Step 600
600
#A55967
oklch(55.7% 0.1 9.1)
-
Step 700
700
#8D4955
oklch(49.2% 0.093 9.9)
-
Step 800
800
#723C46
oklch(42.7% 0.076 9)
-
Step 900
900 (this color)
#643A41
oklch(40.2% 0.06 9.3)
-
Step 950
950
#371E22
oklch(27% 0.039 9.7)
#643A41 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) | #414141 | 0.066 |
| Deuteranopia (no green cones) | #4B4940 | 0.061 |
| Tritanopia (no blue cones) | #6B363C | 0.016 |
| Achromatopsia (no color) | #464646 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643A41
#643A41
oklch(40.2% 0.06 9.3)
- #17524F
#17524F
oklch(40.1% 0.059 190.2)
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 #643A41, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.007
- Brownish Purple #76424E ΔE 0.046
- Charcoal Grey #3C4142 ΔE 0.073
- Chestnut #742802 ΔE 0.074
- Mud Brown #60460F ΔE 0.083
- Onyx #343A40 ΔE 0.088
- Red Brown #8B2E16 ΔE 0.089
- Wine Red #7B0323 ΔE 0.092
Use #643A41 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.