#663C04
Closest named color: Mud Brown (#60460F). oklch(39.8% 0.086 65.8), rgb(102, 60, 4).
Aa
White text reads best on this color (9.48:1).
About this color
#663C04 is a dark, moderately saturated brown. In OKLCH its lightness is 40%, its chroma 0.086 and its hue 66°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.028 away. White text reads best on it, at 9.48:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.086) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.21:1 |
| White text | 9.48:1 |
Values
| HEX | #663C04 |
| RGB | rgb(102, 60, 4) |
| HSL | hsl(34, 92%, 21%) |
| OKLCH | oklch(39.8% 0.086 65.8) |
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 #663C04 | 9.48:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #663C04 | 2.21:1 | Fails | Lc 12.3 | Not readable |
| #663C04 text on white | 9.48:1 | AAA | Lc 91.6 | Preferred for body text |
| #663C04 text on black | 2.21:1 | Fails | Lc -10.7 | 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
#FAF4EF
oklch(97% 0.009 62.6)
-
Step 100
100
#F3E8DD
oklch(93.7% 0.019 67.6)
-
Step 200
200
#EAD5C1
oklch(88.5% 0.036 66)
-
Step 300
300
#DEB995
oklch(80.9% 0.064 65.9)
-
Step 400
400
#CD9357
oklch(70.7% 0.104 65.7)
-
Step 500
500
#BF761A
oklch(63.1% 0.133 65.3)
-
Step 600
600
#A36200
oklch(55.6% 0.124 66.2)
-
Step 700
700
#8A5200
oklch(49.2% 0.11 66)
-
Step 800
800
#714200
oklch(42.6% 0.095 65.8)
-
Step 900
900 (this color)
#663C04
oklch(39.8% 0.086 65.8)
-
Step 950
950
#382004
oklch(26.9% 0.055 66)
#663C04 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) | #494000 | 0.057 |
| Deuteranopia (no green cones) | #534A05 | 0.052 |
| Tritanopia (no blue cones) | #703232 | 0.065 |
| Achromatopsia (no color) | #464646 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663C04
#663C04
oklch(39.8% 0.086 65.8)
- #164B72
#164B72
oklch(39.9% 0.086 245)
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 #663C04, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.028
- Chestnut #742802 ΔE 0.052
- Green Brown #544E03 ΔE 0.060
- Olive Brown #645403 ΔE 0.069
- Purple Brown #673A3F ΔE 0.070
- Milk Chocolate #7F4E1E ΔE 0.073
- Rust Brown #8B3103 ΔE 0.076
- Medium Brown #7F5112 ΔE 0.079
Use #663C04 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.