#643F20
Closest named color: Mud Brown (#60460F). oklch(40.4% 0.069 59), rgb(100, 63, 32).
Aa
White text reads best on this color (9.23:1).
About this color
#643F20 is a dark, muted brown. In OKLCH its lightness is 40%, its chroma 0.069 and its hue 59°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.031 away. White text reads best on it, at 9.23:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | muted (0.069) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.27:1 |
| White text | 9.23:1 |
Values
| HEX | #643F20 |
| RGB | rgb(100, 63, 32) |
| HSL | hsl(27, 52%, 26%) |
| OKLCH | oklch(40.4% 0.069 59) |
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 #643F20 | 9.23:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #643F20 | 2.27:1 | Fails | Lc 12.8 | Not readable |
| #643F20 text on white | 9.23:1 | AAA | Lc 91.1 | Preferred for body text |
| #643F20 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
#BF9779
oklch(70.6% 0.064 58.4)
-
Step 500
500
#AF7D56
oklch(63.1% 0.082 58.5)
-
Step 600
600
#9A663B
oklch(55.7% 0.089 59.1)
-
Step 700
700
#83542D
oklch(49% 0.083 58.8)
-
Step 800
800 (this color)
#643F20
oklch(40.4% 0.069 59)
-
Step 900
900
#573A24
oklch(37.7% 0.054 57.4)
-
Step 950
950
#332215
oklch(26.9% 0.034 58.1)
#643F20 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) | #4A421D | 0.050 |
| Deuteranopia (no green cones) | #534B20 | 0.046 |
| Tritanopia (no blue cones) | #6D3738 | 0.049 |
| Achromatopsia (no color) | #474747 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643F20
#643F20
oklch(40.4% 0.069 59)
- #204E6A
#204E6A
oklch(40.5% 0.069 238.5)
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 #643F20, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.031
- Purple Brown #673A3F ΔE 0.052
- Chestnut #742802 ΔE 0.057
- Green Brown #544E03 ΔE 0.063
- Milk Chocolate #7F4E1E ΔE 0.071
- Olive Brown #645403 ΔE 0.071
- Brownish Purple #76424E ΔE 0.076
- Medium Brown #7F5112 ΔE 0.078
Use #643F20 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.