#643A39
Closest named color: Purple Brown (#673A3F). oklch(39.9% 0.06 21.6), rgb(100, 58, 57).
Aa
White text reads best on this color (9.51:1).
About this color
#643A39 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.060 and its hue 22°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.012 away. White text reads best on it, at 9.51:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.060) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.20:1 |
| White text | 9.51:1 |
Values
| HEX | #643A39 |
| RGB | rgb(100, 58, 57) |
| HSL | hsl(1, 27%, 31%) |
| OKLCH | oklch(39.9% 0.06 21.6) |
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 #643A39 | 9.51:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #643A39 | 2.20:1 | Fails | Lc 12.1 | Not readable |
| #643A39 text on white | 9.51:1 | AAA | Lc 91.9 | Preferred for body text |
| #643A39 text on black | 2.20:1 | Fails | Lc -10.5 | 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
#F2E7E6
oklch(93.6% 0.012 23.7)
-
Step 200
200
#E9D3D2
oklch(88.5% 0.025 20.8)
-
Step 300
300
#DCB6B4
oklch(80.9% 0.044 21.6)
-
Step 400
400
#CA8F8D
oklch(70.7% 0.072 21.2)
-
Step 500
500
#BB7271
oklch(63.1% 0.093 20.9)
-
Step 600
600
#A65A59
oklch(55.6% 0.1 21.6)
-
Step 700
700
#8E4949
oklch(49% 0.094 21)
-
Step 800
800
#733D3C
oklch(42.7% 0.076 21.9)
-
Step 900
900 (this color)
#643A39
oklch(39.9% 0.06 21.6)
-
Step 950
950
#371F1E
oklch(27.1% 0.038 22.4)
#643A39 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) | #434039 | 0.062 |
| Deuteranopia (no green cones) | #4D4938 | 0.059 |
| Tritanopia (no blue cones) | #6C353A | 0.020 |
| Achromatopsia (no color) | #454545 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643A39
#643A39
oklch(39.9% 0.06 21.6)
- #145155
#145155
oklch(39.9% 0.06 201.5)
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 #643A39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.012
- Brownish Purple #76424E ΔE 0.052
- Chestnut #742802 ΔE 0.064
- Mud Brown #60460F ΔE 0.071
- Charcoal Grey #3C4142 ΔE 0.072
- Red Brown #8B2E16 ΔE 0.083
- Reddy Brown #6E1005 ΔE 0.087
- Rust Brown #8B3103 ΔE 0.088
Use #643A39 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.