#643B2D
Closest named color: Purple Brown (#673A3F). oklch(39.8% 0.063 39.6), rgb(100, 59, 45).
Aa
White text reads best on this color (9.52:1).
About this color
#643B2D is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.063 and its hue 40°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.030 away. White text reads best on it, at 9.52:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.063) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.20:1 |
| White text | 9.52:1 |
Values
| HEX | #643B2D |
| RGB | rgb(100, 59, 45) |
| HSL | hsl(15, 38%, 28%) |
| OKLCH | oklch(39.8% 0.063 39.6) |
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 #643B2D | 9.52:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #643B2D | 2.20:1 | Fails | Lc 12.1 | Not readable |
| #643B2D text on white | 9.52:1 | AAA | Lc 91.9 | Preferred for body text |
| #643B2D 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
#F9F4F2
oklch(97% 0.006 43.3)
-
Step 100
100
#F3E7E3
oklch(93.6% 0.014 39.4)
-
Step 200
200
#E9D4CD
oklch(88.5% 0.025 39.4)
-
Step 300
300
#DDB7AA
oklch(80.9% 0.048 39.8)
-
Step 400
400
#CA917D
oklch(70.7% 0.075 40.2)
-
Step 500
500
#BB755D
oklch(63.1% 0.095 39.7)
-
Step 600
600
#A65C43
oklch(55.5% 0.104 39.3)
-
Step 700
700
#8E4B34
oklch(48.9% 0.097 39.5)
-
Step 800
800
#743E2C
oklch(42.7% 0.081 39.1)
-
Step 900
900 (this color)
#643B2D
oklch(39.8% 0.063 39.6)
-
Step 950
950
#371F17
oklch(26.9% 0.04 39.2)
#643B2D 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) | #45402C | 0.059 |
| Deuteranopia (no green cones) | #4F492D | 0.055 |
| Tritanopia (no blue cones) | #6D3437 | 0.032 |
| Achromatopsia (no color) | #454545 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643B2D
#643B2D
oklch(39.8% 0.063 39.6)
- #154F5E
#154F5E
oklch(39.8% 0.063 218.9)
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 #643B2D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.030
- Mud Brown #60460F ΔE 0.054
- Chestnut #742802 ΔE 0.054
- Brownish Purple #76424E ΔE 0.063
- Charcoal Grey #3C4142 ΔE 0.075
- Red Brown #8B2E16 ΔE 0.079
- Rust Brown #8B3103 ΔE 0.081
- Milk Chocolate #7F4E1E ΔE 0.083
Use #643B2D 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.