#643C2F
Closest named color: Purple Brown (#673A3F). oklch(40.1% 0.061 38.8), rgb(100, 60, 47).
Aa
White text reads best on this color (9.42:1).
About this color
#643C2F is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.061 and its hue 39°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.028 away. White text reads best on it, at 9.42:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.061) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.22:1 |
| White text | 9.42:1 |
Values
| HEX | #643C2F |
| RGB | rgb(100, 60, 47) |
| HSL | hsl(15, 36%, 29%) |
| OKLCH | oklch(40.1% 0.061 38.8) |
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 #643C2F | 9.42:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #643C2F | 2.22:1 | Fails | Lc 12.4 | Not readable |
| #643C2F text on white | 9.42:1 | AAA | Lc 91.6 | Preferred for body text |
| #643C2F text on black | 2.22:1 | Fails | Lc -10.8 | 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
#F2E7E3
oklch(93.6% 0.013 41.2)
-
Step 200
200
#E9D4CD
oklch(88.5% 0.025 39.4)
-
Step 300
300
#DCB7AB
oklch(80.9% 0.046 38.8)
-
Step 400
400
#C9917F
oklch(70.6% 0.073 38.6)
-
Step 500
500
#BA755F
oklch(63.1% 0.093 38.4)
-
Step 600
600
#A55D45
oklch(55.6% 0.101 39.1)
-
Step 700
700
#8D4C37
oklch(49% 0.094 38.6)
-
Step 800
800
#733F2E
oklch(42.8% 0.078 38.8)
-
Step 900
900 (this color)
#643C2F
oklch(40.1% 0.061 38.8)
-
Step 950
950
#372018
oklch(27.1% 0.039 39.9)
#643C2F 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) | #46412E | 0.057 |
| Deuteranopia (no green cones) | #50492F | 0.051 |
| Tritanopia (no blue cones) | #6D3639 | 0.031 |
| Achromatopsia (no color) | #464646 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643C2F
#643C2F
oklch(40.1% 0.061 38.8)
- #19505E
#19505E
oklch(40.2% 0.061 218.1)
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 #643C2F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.028
- Mud Brown #60460F ΔE 0.054
- Chestnut #742802 ΔE 0.057
- Brownish Purple #76424E ΔE 0.060
- Charcoal Grey #3C4142 ΔE 0.074
- Red Brown #8B2E16 ΔE 0.079
- Rust Brown #8B3103 ΔE 0.081
- Milk Chocolate #7F4E1E ΔE 0.082
Use #643C2F 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.