#663F14
Closest named color: Mud Brown (#60460F). oklch(40.5% 0.078 64.4), rgb(102, 63, 20).
Aa
White text reads best on this color (9.18:1).
About this color
#663F14 is a dark, moderately saturated brown. In OKLCH its lightness is 41%, its chroma 0.078 and its hue 64°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.024 away. White text reads best on it, at 9.18:1.
| Hue family | Browns |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.078) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.28:1 |
| White text | 9.18:1 |
Values
| HEX | #663F14 |
| RGB | rgb(102, 63, 20) |
| HSL | hsl(31, 67%, 24%) |
| OKLCH | oklch(40.5% 0.078 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 #663F14 | 9.18:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #663F14 | 2.28:1 | Fails | Lc 13.0 | Not readable |
| #663F14 text on white | 9.18:1 | AAA | Lc 90.9 | Preferred for body text |
| #663F14 text on black | 2.28:1 | 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
#F8F5F1
oklch(97.1% 0.006 75.4)
-
Step 100
100
#F0E8E1
oklch(93.5% 0.013 63.9)
-
Step 200
200
#E6D6C8
oklch(88.5% 0.026 63.7)
-
Step 300
300
#D6BBA2
oklch(80.9% 0.046 64.9)
-
Step 400
400
#C19770
oklch(70.6% 0.073 64.1)
-
Step 500
500
#B17D4A
oklch(63.1% 0.093 64.2)
-
Step 600
600
#9C652B
oklch(55.5% 0.102 64.1)
-
Step 700
700
#85541E
oklch(49.1% 0.094 64.6)
-
Step 800
800 (this color)
#663F14
oklch(40.5% 0.078 64.4)
-
Step 900
900
#583A1C
oklch(37.7% 0.061 64)
-
Step 950
950
#342211
oklch(27% 0.039 63.2)
#663F14 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) | #4B420E | 0.053 |
| Deuteranopia (no green cones) | #554B15 | 0.045 |
| Tritanopia (no blue cones) | #703636 | 0.059 |
| Achromatopsia (no color) | #484848 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663F14
#663F14
oklch(40.5% 0.078 64.4)
- #1E4D70
#1E4D70
oklch(40.5% 0.078 244.1)
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 #663F14, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.024
- Chestnut #742802 ΔE 0.056
- Green Brown #544E03 ΔE 0.058
- Purple Brown #673A3F ΔE 0.063
- Olive Brown #645403 ΔE 0.064
- Milk Chocolate #7F4E1E ΔE 0.067
- Medium Brown #7F5112 ΔE 0.073
- Rust Brown #8B3103 ΔE 0.075
Use #663F14 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.