#643F00
Closest named color: Mud Brown (#60460F). oklch(40.1% 0.086 72.1), rgb(100, 63, 0).
Aa
White text reads best on this color (9.32:1).
About this color
#643F00 is a dark, moderately saturated brown. In OKLCH its lightness is 40%, its chroma 0.086 and its hue 72°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.019 away. White text reads best on it, at 9.32:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.086) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.25:1 |
| White text | 9.32:1 |
Values
| HEX | #643F00 |
| RGB | rgb(100, 63, 0) |
| HSL | hsl(38, 100%, 20%) |
| OKLCH | oklch(40.1% 0.086 72.1) |
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 #643F00 | 9.32:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #643F00 | 2.25:1 | Fails | Lc 12.7 | Not readable |
| #643F00 text on white | 9.32:1 | AAA | Lc 91.2 | Preferred for body text |
| #643F00 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
#F9F5EF
oklch(97.2% 0.009 78.3)
-
Step 100
100
#F2E8DD
oklch(93.6% 0.018 70.2)
-
Step 200
200
#E8D6C0
oklch(88.5% 0.036 72.9)
-
Step 300
300
#DBBB93
oklch(81% 0.065 72.9)
-
Step 400
400
#C89654
oklch(70.7% 0.103 72.5)
-
Step 500
500
#BA7A0E
oklch(63.1% 0.132 71.8)
-
Step 600
600
#9D6600
oklch(55.6% 0.119 72.5)
-
Step 700
700
#855500
oklch(49.1% 0.105 71.8)
-
Step 800
800
#6D4500
oklch(42.6% 0.091 72)
-
Step 900
900 (this color)
#643F00
oklch(40.1% 0.086 72.1)
-
Step 950
950
#372103
oklch(27% 0.055 70.4)
#643F00 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) | #4C4200 | 0.046 |
| Deuteranopia (no green cones) | #544A02 | 0.042 |
| Tritanopia (no blue cones) | #6E3635 | 0.070 |
| Achromatopsia (no color) | #474747 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643F00
#643F00
oklch(40.1% 0.086 72.1)
- #214A75
#214A75
oklch(40.2% 0.086 251.7)
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 #643F00, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.019
- Green Brown #544E03 ΔE 0.050
- Olive Brown #645403 ΔE 0.060
- Chestnut #742802 ΔE 0.062
- Milk Chocolate #7F4E1E ΔE 0.072
- Medium Brown #7F5112 ΔE 0.076
- Purple Brown #673A3F ΔE 0.076
- Rust Brown #8B3103 ΔE 0.082
Use #643F00 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.