#663C19
Closest named color: Mud Brown (#60460F). oklch(40% 0.076 57.7), rgb(102, 60, 25).
Aa
White text reads best on this color (9.43:1).
About this color
#663C19 is a dark, moderately saturated brown. In OKLCH its lightness is 40%, its chroma 0.076 and its hue 58°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.034 away. White text reads best on it, at 9.43:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.076) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.22:1 |
| White text | 9.43:1 |
Values
| HEX | #663C19 |
| RGB | rgb(102, 60, 25) |
| HSL | hsl(27, 61%, 25%) |
| OKLCH | oklch(40% 0.076 57.7) |
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 #663C19 | 9.43:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #663C19 | 2.22:1 | Fails | Lc 12.4 | Not readable |
| #663C19 text on white | 9.43:1 | AAA | Lc 91.6 | Preferred for body text |
| #663C19 text on black | 2.22:1 | Fails | Lc -10.8 | 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
#F3E7DF
oklch(93.5% 0.017 56.2)
-
Step 200
200
#EAD4C5
oklch(88.4% 0.032 56.6)
-
Step 300
300
#DEB89D
oklch(80.9% 0.057 57.2)
-
Step 400
400
#CC9266
oklch(70.7% 0.092 57.8)
-
Step 500
500
#BE763A
oklch(63.2% 0.117 58)
-
Step 600
600
#A95D11
oklch(55.6% 0.127 57.8)
-
Step 700
700
#914C00
oklch(49.1% 0.118 57.5)
-
Step 800
800
#763F08
oklch(42.8% 0.098 57.8)
-
Step 900
900 (this color)
#663C19
oklch(40% 0.076 57.7)
-
Step 950
950
#38200C
oklch(27% 0.049 58.3)
#663C19 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) | #494015 | 0.057 |
| Deuteranopia (no green cones) | #534A19 | 0.052 |
| Tritanopia (no blue cones) | #703334 | 0.053 |
| Achromatopsia (no color) | #464646 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663C19
#663C19
oklch(40% 0.076 57.7)
- #154D6C
#154D6C
oklch(40% 0.077 237.9)
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 #663C19, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.034
- Chestnut #742802 ΔE 0.049
- Purple Brown #673A3F ΔE 0.055
- Green Brown #544E03 ΔE 0.067
- Milk Chocolate #7F4E1E ΔE 0.073
- Rust Brown #8B3103 ΔE 0.074
- Olive Brown #645403 ΔE 0.075
- Red Brown #8B2E16 ΔE 0.077
Use #663C19 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.