#643F09
Closest named color: Mud Brown (#60460F). oklch(40.2% 0.082 69.8), rgb(100, 63, 9).
Aa
White text reads best on this color (9.30:1).
About this color
#643F09 is a dark, moderately saturated brown. In OKLCH its lightness is 40%, its chroma 0.082 and its hue 70°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.020 away. White text reads best on it, at 9.30:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.082) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.25:1 |
| White text | 9.30:1 |
Values
| HEX | #643F09 |
| RGB | rgb(100, 63, 9) |
| HSL | hsl(36, 83%, 21%) |
| OKLCH | oklch(40.2% 0.082 69.8) |
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 #643F09 | 9.30:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #643F09 | 2.25:1 | Fails | Lc 12.7 | Not readable |
| #643F09 text on white | 9.30:1 | AAA | Lc 91.2 | Preferred for body text |
| #643F09 text on black | 2.25:1 | Fails | Lc -11.1 | 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
#F9F5F0
oklch(97.2% 0.008 73.7)
-
Step 100
100
#F2E8DD
oklch(93.6% 0.018 70.2)
-
Step 200
200
#E8D6C1
oklch(88.5% 0.035 71.6)
-
Step 300
300
#DBBA96
oklch(80.9% 0.061 69.2)
-
Step 400
400
#C89559
oklch(70.6% 0.099 69.6)
-
Step 500
500
#B97A20
oklch(63.1% 0.126 70.1)
-
Step 600
600
#9F6400
oklch(55.5% 0.12 69.8)
-
Step 700
700
#875400
oklch(49.2% 0.107 69.6)
-
Step 800
800
#6F4400
oklch(42.7% 0.093 69.4)
-
Step 900
900 (this color)
#643F09
oklch(40.2% 0.082 69.8)
-
Step 950
950
#362105
oklch(26.9% 0.052 70.1)
#643F09 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) | #4B4200 | 0.050 |
| Deuteranopia (no green cones) | #544A0B | 0.042 |
| Tritanopia (no blue cones) | #6E3635 | 0.065 |
| Achromatopsia (no color) | #474747 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643F09
#643F09
oklch(40.2% 0.082 69.8)
- #214B72
#214B72
oklch(40.3% 0.081 249)
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 #643F09, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.020
- Green Brown #544E03 ΔE 0.052
- Chestnut #742802 ΔE 0.060
- Olive Brown #645403 ΔE 0.062
- Milk Chocolate #7F4E1E ΔE 0.071
- Purple Brown #673A3F ΔE 0.071
- Medium Brown #7F5112 ΔE 0.075
- Rust Brown #8B3103 ΔE 0.081
Use #643F09 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.