#643F3B
Closest named color: Purple Brown (#673A3F). oklch(41% 0.053 26.4), rgb(100, 63, 59).
Aa
White text reads best on this color (9.06:1).
About this color
#643F3B is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.053 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.018 away. White text reads best on it, at 9.06:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.053) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.31:1 |
| White text | 9.06:1 |
Values
| HEX | #643F3B |
| RGB | rgb(100, 63, 59) |
| HSL | hsl(6, 26%, 31%) |
| OKLCH | oklch(41% 0.053 26.4) |
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 #643F3B | 9.06:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #643F3B | 2.31:1 | Fails | Lc 13.2 | Not readable |
| #643F3B text on white | 9.06:1 | AAA | Lc 90.7 | Preferred for body text |
| #643F3B text on black | 2.31:1 | Fails | Lc -11.6 | 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 800.
-
Step 50
50
#F8F4F4
oklch(97% 0.004 17.2)
-
Step 100
100
#F0E8E7
oklch(93.7% 0.009 26)
-
Step 200
200
#E4D5D3
oklch(88.5% 0.017 26.7)
-
Step 300
300
#D4B9B6
oklch(80.8% 0.031 25.4)
-
Step 400
400
#BE9590
oklch(70.7% 0.05 26.4)
-
Step 500
500
#AD7B75
oklch(63.1% 0.064 26.7)
-
Step 600
600
#98645E
oklch(55.7% 0.069 26.7)
-
Step 700
700
#81524D
oklch(49% 0.064 26.3)
-
Step 800
800 (this color)
#643F3B
oklch(41% 0.053 26.4)
-
Step 900
900
#563936
oklch(37.7% 0.042 25.8)
-
Step 950
950
#322220
oklch(27.1% 0.025 26.9)
#643F3B 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) | #47443B | 0.054 |
| Deuteranopia (no green cones) | #504B3A | 0.049 |
| Tritanopia (no blue cones) | #6B3A3E | 0.020 |
| Achromatopsia (no color) | #494949 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643F3B
#643F3B
oklch(41% 0.053 26.4)
- #225258
#225258
oklch(40.8% 0.052 206.4)
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 #643F3B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.018
- Brownish Purple #76424E ΔE 0.047
- Mud Brown #60460F ΔE 0.064
- Chestnut #742802 ΔE 0.070
- Charcoal Grey #3C4142 ΔE 0.071
- Milk Chocolate #7F4E1E ΔE 0.083
- Red Brown #8B2E16 ΔE 0.084
- Rust Brown #8B3103 ΔE 0.087
Use #643F3B 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.