#643D31
Closest named color: Purple Brown (#673A3F). oklch(40.3% 0.059 37.9), rgb(100, 61, 49).
Aa
White text reads best on this color (9.31:1).
About this color
#643D31 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.059 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.027 away. White text reads best on it, at 9.31:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.059) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.25:1 |
| White text | 9.31:1 |
Values
| HEX | #643D31 |
| RGB | rgb(100, 61, 49) |
| HSL | hsl(14, 34%, 29%) |
| OKLCH | oklch(40.3% 0.059 37.9) |
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 #643D31 | 9.31:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #643D31 | 2.25:1 | Fails | Lc 12.6 | Not readable |
| #643D31 text on white | 9.31:1 | AAA | Lc 91.4 | Preferred for body text |
| #643D31 text on black | 2.25:1 | Fails | Lc -11.0 | 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
#F8F4F3
oklch(97% 0.005 34.3)
-
Step 100
100
#F0E8E5
oklch(93.6% 0.01 41.9)
-
Step 200
200
#E5D5D0
oklch(88.5% 0.019 38.1)
-
Step 300
300
#D5BAB1
oklch(81% 0.034 39.3)
-
Step 400
400
#C09588
oklch(70.7% 0.055 37.5)
-
Step 500
500
#AF7B6B
oklch(63.1% 0.07 37.8)
-
Step 600
600
#9A6352
oklch(55.5% 0.077 37.9)
-
Step 700
700
#845243
oklch(49.1% 0.072 37.5)
-
Step 800
800 (this color)
#643D31
oklch(40.3% 0.059 37.9)
-
Step 900
900
#573930
oklch(37.7% 0.046 37.4)
-
Step 950
950
#33221C
oklch(27.1% 0.029 40.3)
#643D31 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) | #474230 | 0.055 |
| Deuteranopia (no green cones) | #504A31 | 0.051 |
| Tritanopia (no blue cones) | #6C373A | 0.029 |
| Achromatopsia (no color) | #474747 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643D31
#643D31
oklch(40.3% 0.059 37.9)
- #1C505E
#1C505E
oklch(40.3% 0.059 218.8)
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 #643D31, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.027
- Mud Brown #60460F ΔE 0.054
- Brownish Purple #76424E ΔE 0.058
- Chestnut #742802 ΔE 0.059
- Charcoal Grey #3C4142 ΔE 0.073
- Red Brown #8B2E16 ΔE 0.080
- Milk Chocolate #7F4E1E ΔE 0.081
- Rust Brown #8B3103 ΔE 0.082
Use #643D31 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.