#643D39
Closest named color: Purple Brown (#673A3F). oklch(40.5% 0.056 26.2), rgb(100, 61, 57).
Aa
White text reads best on this color (9.25:1).
About this color
#643D39 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.056 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.016 away. White text reads best on it, at 9.25:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.056) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.26:1 |
| White text | 9.25:1 |
Values
| HEX | #643D39 |
| RGB | rgb(100, 61, 57) |
| HSL | hsl(6, 27%, 31%) |
| OKLCH | oklch(40.5% 0.056 26.2) |
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 #643D39 | 9.25:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #643D39 | 2.26:1 | Fails | Lc 12.8 | Not readable |
| #643D39 text on white | 9.25:1 | AAA | Lc 91.2 | Preferred for body text |
| #643D39 text on black | 2.26:1 | Fails | Lc -11.1 | 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
#F0E8E6
oklch(93.7% 0.009 34.3)
-
Step 200
200
#E5D5D3
oklch(88.5% 0.018 26.1)
-
Step 300
300
#D5B9B6
oklch(80.9% 0.033 25.1)
-
Step 400
400
#BF9590
oklch(70.8% 0.051 26.3)
-
Step 500
500
#AE7A74
oklch(63% 0.066 26.5)
-
Step 600
600
#99635D
oklch(55.6% 0.071 26.5)
-
Step 700
700
#83514C
oklch(49% 0.068 26)
-
Step 800
800 (this color)
#643D39
oklch(40.5% 0.056 26.2)
-
Step 900
900
#573935
oklch(37.8% 0.044 27.7)
-
Step 950
950
#33211F
oklch(27% 0.028 26.2)
#643D39 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) | #454339 | 0.058 |
| Deuteranopia (no green cones) | #4F4A38 | 0.053 |
| Tritanopia (no blue cones) | #6C383C | 0.021 |
| Achromatopsia (no color) | #474747 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643D39
#643D39
oklch(40.5% 0.056 26.2)
- #1D5258
#1D5258
oklch(40.6% 0.056 205.6)
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 #643D39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.016
- Brownish Purple #76424E ΔE 0.050
- Mud Brown #60460F ΔE 0.065
- Chestnut #742802 ΔE 0.066
- Charcoal Grey #3C4142 ΔE 0.071
- Red Brown #8B2E16 ΔE 0.083
- Milk Chocolate #7F4E1E ΔE 0.086
- Rust Brown #8B3103 ΔE 0.087
Use #643D39 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.