#643A35
Closest named color: Purple Brown (#673A3F). oklch(39.8% 0.061 27.4), rgb(100, 58, 53).
Aa
White text reads best on this color (9.55:1).
About this color
#643A35 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.061 and its hue 27°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.017 away. White text reads best on it, at 9.55:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.061) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.19:1 |
| White text | 9.55:1 |
Values
| HEX | #643A35 |
| RGB | rgb(100, 58, 53) |
| HSL | hsl(6, 31%, 30%) |
| OKLCH | oklch(39.8% 0.061 27.4) |
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 #643A35 | 9.55:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #643A35 | 2.19:1 | Fails | Lc 12.0 | Not readable |
| #643A35 text on white | 9.55:1 | AAA | Lc 91.9 | Preferred for body text |
| #643A35 text on black | 2.19:1 | 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
#F9F4F3
oklch(97.1% 0.006 31.1)
-
Step 100
100
#F3E7E5
oklch(93.7% 0.013 28.9)
-
Step 200
200
#EAD3D0
oklch(88.5% 0.026 26.6)
-
Step 300
300
#DDB6B1
oklch(80.9% 0.046 26.7)
-
Step 400
400
#CA8F88
oklch(70.6% 0.073 26.6)
-
Step 500
500
#BB736A
oklch(63.1% 0.093 27.7)
-
Step 600
600
#A65A52
oklch(55.5% 0.101 27.1)
-
Step 700
700
#8E4A43
oklch(49.1% 0.093 27.1)
-
Step 800
800
#743D37
oklch(42.7% 0.078 27.3)
-
Step 900
900 (this color)
#643A35
oklch(39.8% 0.061 27.4)
-
Step 950
950
#371F1C
oklch(27% 0.038 27.6)
#643A35 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) | #434034 | 0.063 |
| Deuteranopia (no green cones) | #4D4934 | 0.059 |
| Tritanopia (no blue cones) | #6C3439 | 0.024 |
| Achromatopsia (no color) | #454545 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643A35
#643A35
oklch(39.8% 0.061 27.4)
- #135058
#135058
oklch(39.8% 0.061 207.9)
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 #643A35, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.017
- Brownish Purple #76424E ΔE 0.055
- Chestnut #742802 ΔE 0.060
- Mud Brown #60460F ΔE 0.066
- Charcoal Grey #3C4142 ΔE 0.073
- Red Brown #8B2E16 ΔE 0.081
- Reddy Brown #6E1005 ΔE 0.085
- Rust Brown #8B3103 ΔE 0.085
Use #643A35 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.