#643C1F
Closest named color: Mud Brown (#60460F). oklch(39.8% 0.071 55), rgb(100, 60, 31).
Aa
White text reads best on this color (9.51:1).
About this color
#643C1F is a dark, moderately saturated brown. In OKLCH its lightness is 40%, its chroma 0.071 and its hue 55°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.037 away. White text reads best on it, at 9.51:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.071) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.20:1 |
| White text | 9.51:1 |
Values
| HEX | #643C1F |
| RGB | rgb(100, 60, 31) |
| HSL | hsl(25, 53%, 26%) |
| OKLCH | oklch(39.8% 0.071 55) |
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 #643C1F | 9.51:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #643C1F | 2.20:1 | Fails | Lc 12.2 | Not readable |
| #643C1F text on white | 9.51:1 | AAA | Lc 91.8 | Preferred for body text |
| #643C1F text on black | 2.20:1 | Fails | Lc -10.6 | 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 900.
-
Step 50
50
#F9F4F1
oklch(97% 0.007 53.4)
-
Step 100
100
#F2E7E0
oklch(93.5% 0.015 54.9)
-
Step 200
200
#E9D5C7
oklch(88.6% 0.029 57.3)
-
Step 300
300
#DCB8A1
oklch(80.8% 0.052 54.4)
-
Step 400
400
#CA936D
oklch(70.8% 0.085 55.5)
-
Step 500
500
#BB7745
oklch(63.1% 0.108 55.6)
-
Step 600
600
#A75E25
oklch(55.6% 0.118 54.8)
-
Step 700
700
#8F4D17
oklch(49.1% 0.11 54.7)
-
Step 800
800
#744016
oklch(42.8% 0.09 55.5)
-
Step 900
900 (this color)
#643C1F
oklch(39.8% 0.071 55)
-
Step 950
950
#372010
oklch(26.9% 0.044 54.5)
#643C1F 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) | #48401C | 0.054 |
| Deuteranopia (no green cones) | #51491F | 0.050 |
| Tritanopia (no blue cones) | #6D3435 | 0.046 |
| Achromatopsia (no color) | #464646 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643C1F
#643C1F
oklch(39.8% 0.071 55)
- #184D68
#184D68
oklch(39.9% 0.071 235)
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 #643C1F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.037
- Purple Brown #673A3F ΔE 0.049
- Chestnut #742802 ΔE 0.051
- Green Brown #544E03 ΔE 0.070
- Milk Chocolate #7F4E1E ΔE 0.076
- Brownish Purple #76424E ΔE 0.077
- Rust Brown #8B3103 ΔE 0.078
- Olive Brown #645403 ΔE 0.079
Use #643C1F 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.