#663C09
Closest named color: Mud Brown (#60460F). oklch(39.8% 0.084 64.4), rgb(102, 60, 9).
Aa
White text reads best on this color (9.47:1).
About this color
#663C09 is a dark, moderately saturated brown. In OKLCH its lightness is 40%, its chroma 0.084 and its hue 64°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.029 away. White text reads best on it, at 9.47:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.084) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.21:1 |
| White text | 9.47:1 |
Values
| HEX | #663C09 |
| RGB | rgb(102, 60, 9) |
| HSL | hsl(33, 84%, 22%) |
| OKLCH | oklch(39.8% 0.084 64.4) |
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 #663C09 | 9.47:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #663C09 | 2.21:1 | Fails | Lc 12.3 | Not readable |
| #663C09 text on white | 9.47:1 | AAA | Lc 91.6 | Preferred for body text |
| #663C09 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
#FAF4F0
oklch(97.1% 0.008 56.3)
-
Step 100
100
#F3E8DE
oklch(93.7% 0.018 64.9)
-
Step 200
200
#EAD5C2
oklch(88.5% 0.035 64.5)
-
Step 300
300
#DEB996
oklch(80.9% 0.064 65.1)
-
Step 400
400
#CD935A
oklch(70.8% 0.102 64.4)
-
Step 500
500
#BF7622
oklch(63.1% 0.13 64)
-
Step 600
600
#A56100
oklch(55.7% 0.126 64.5)
-
Step 700
700
#8B5100
oklch(49.2% 0.111 64.6)
-
Step 800
800
#724200
oklch(42.7% 0.096 65.1)
-
Step 900
900 (this color)
#663C09
oklch(39.8% 0.084 64.4)
-
Step 950
950
#382006
oklch(27% 0.053 64.2)
#663C09 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) | #494001 | 0.058 |
| Deuteranopia (no green cones) | #534A0A | 0.052 |
| Tritanopia (no blue cones) | #703233 | 0.064 |
| Achromatopsia (no color) | #464646 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663C09
#663C09
oklch(39.8% 0.084 64.4)
- #164B71
#164B71
oklch(39.8% 0.084 244.3)
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 #663C09, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.029
- Chestnut #742802 ΔE 0.051
- Green Brown #544E03 ΔE 0.061
- Purple Brown #673A3F ΔE 0.067
- Olive Brown #645403 ΔE 0.070
- Milk Chocolate #7F4E1E ΔE 0.073
- Rust Brown #8B3103 ΔE 0.076
- Medium Brown #7F5112 ΔE 0.079
Use #663C09 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.