#663F1D
Closest named color: Mud Brown (#60460F). oklch(40.6% 0.073 59.5), rgb(102, 63, 29).
Aa
White text reads best on this color (9.15:1).
About this color
#663F1D is a dark, moderately saturated brown. In OKLCH its lightness is 41%, its chroma 0.073 and its hue 60°. 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 9.15:1.
| Hue family | Browns |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.073) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.29:1 |
| White text | 9.15:1 |
Values
| HEX | #663F1D |
| RGB | rgb(102, 63, 29) |
| HSL | hsl(28, 56%, 26%) |
| OKLCH | oklch(40.6% 0.073 59.5) |
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 #663F1D | 9.15:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #663F1D | 2.29:1 | Fails | Lc 13.1 | Not readable |
| #663F1D text on white | 9.15:1 | AAA | Lc 90.9 | Preferred for body text |
| #663F1D text on black | 2.29:1 | Fails | Lc -11.4 | 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 800.
-
Step 50
50
#F8F5F2
oklch(97.2% 0.005 67.8)
-
Step 100
100
#F0E8E2
oklch(93.6% 0.012 59.6)
-
Step 200
200
#E5D6CA
oklch(88.5% 0.023 61.2)
-
Step 300
300
#D6BBA6
oklch(81% 0.042 60)
-
Step 400
400
#C19776
oklch(70.7% 0.068 59.5)
-
Step 500
500
#B07D52
oklch(63.1% 0.086 60.4)
-
Step 600
600
#9C6536
oklch(55.7% 0.095 59.5)
-
Step 700
700
#855428
oklch(49.2% 0.088 60.3)
-
Step 800
800 (this color)
#663F1D
oklch(40.6% 0.073 59.5)
-
Step 900
900
#583A21
oklch(37.7% 0.057 59.6)
-
Step 950
950
#332214
oklch(26.9% 0.035 60)
#663F1D 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) | #4B4319 | 0.052 |
| Deuteranopia (no green cones) | #544B1D | 0.047 |
| Tritanopia (no blue cones) | #703737 | 0.051 |
| Achromatopsia (no color) | #484848 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663F1D
#663F1D
oklch(40.6% 0.073 59.5)
- #1E4E6C
#1E4E6C
oklch(40.6% 0.072 239.5)
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 #663F1D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.029
- Purple Brown #673A3F ΔE 0.054
- Chestnut #742802 ΔE 0.055
- Green Brown #544E03 ΔE 0.063
- Milk Chocolate #7F4E1E ΔE 0.067
- Olive Brown #645403 ΔE 0.069
- Medium Brown #7F5112 ΔE 0.075
- Rust Brown #8B3103 ΔE 0.075
Use #663F1D 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.