#643F21
Closest named color: Mud Brown (#60460F). oklch(40.4% 0.068 58.2), rgb(100, 63, 33).
Aa
White text reads best on this color (9.23:1).
About this color
#643F21 is a dark, muted brown. In OKLCH its lightness is 40%, its chroma 0.068 and its hue 58°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.032 away. White text reads best on it, at 9.23:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | muted (0.068) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.27:1 |
| White text | 9.23:1 |
Values
| HEX | #643F21 |
| RGB | rgb(100, 63, 33) |
| HSL | hsl(27, 50%, 26%) |
| OKLCH | oklch(40.4% 0.068 58.2) |
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 #643F21 | 9.23:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #643F21 | 2.27:1 | Fails | Lc 12.9 | Not readable |
| #643F21 text on white | 9.23:1 | AAA | Lc 91.1 | Preferred for body text |
| #643F21 text on black | 2.27:1 | Fails | Lc -11.2 | 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
#F8F5F2
oklch(97.2% 0.005 67.8)
-
Step 100
100
#F0E8E2
oklch(93.6% 0.012 59.6)
-
Step 200
200
#E5D6CB
oklch(88.5% 0.022 58.8)
-
Step 300
300
#D5BBA8
oklch(80.9% 0.04 58.3)
-
Step 400
400
#BF977A
oklch(70.6% 0.063 57.4)
-
Step 500
500
#AF7D57
oklch(63.1% 0.082 57.8)
-
Step 600
600
#9A663C
oklch(55.7% 0.088 58.5)
-
Step 700
700
#83542E
oklch(49% 0.082 58.2)
-
Step 800
800 (this color)
#643F21
oklch(40.4% 0.068 58.2)
-
Step 900
900
#573A24
oklch(37.7% 0.054 57.4)
-
Step 950
950
#332216
oklch(26.9% 0.033 56)
#643F21 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) | #4A421E | 0.050 |
| Deuteranopia (no green cones) | #534B21 | 0.046 |
| Tritanopia (no blue cones) | #6D3738 | 0.048 |
| Achromatopsia (no color) | #474747 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643F21
#643F21
oklch(40.4% 0.068 58.2)
- #204E69
#204E69
oklch(40.5% 0.068 237.5)
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 #643F21, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.032
- Purple Brown #673A3F ΔE 0.051
- Chestnut #742802 ΔE 0.057
- Green Brown #544E03 ΔE 0.064
- Milk Chocolate #7F4E1E ΔE 0.071
- Olive Brown #645403 ΔE 0.071
- Brownish Purple #76424E ΔE 0.075
- Rust Brown #8B3103 ΔE 0.078
Use #643F21 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.