#663F18
Closest named color: Mud Brown (#60460F). oklch(40.6% 0.076 62.5), rgb(102, 63, 24).
Aa
White text reads best on this color (9.17:1).
About this color
#663F18 is a dark, moderately saturated brown. In OKLCH its lightness is 41%, its chroma 0.076 and its hue 62°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.026 away. White text reads best on it, at 9.17:1.
| Hue family | Browns |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.076) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.28:1 |
| White text | 9.17:1 |
Values
| HEX | #663F18 |
| RGB | rgb(102, 63, 24) |
| HSL | hsl(30, 62%, 25%) |
| OKLCH | oklch(40.6% 0.076 62.5) |
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 #663F18 | 9.17:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #663F18 | 2.28:1 | Fails | Lc 13.0 | Not readable |
| #663F18 text on white | 9.17:1 | AAA | Lc 90.9 | Preferred for body text |
| #663F18 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
#E5D6C9
oklch(88.5% 0.024 63.5)
-
Step 300
300
#D6BBA4
oklch(80.9% 0.044 62.6)
-
Step 400
400
#C19773
oklch(70.7% 0.071 61.9)
-
Step 500
500
#B17D4D
oklch(63.2% 0.091 62.7)
-
Step 600
600
#9C6530
oklch(55.6% 0.099 62.2)
-
Step 700
700
#855422
oklch(49.1% 0.092 63)
-
Step 800
800 (this color)
#663F18
oklch(40.6% 0.076 62.5)
-
Step 900
900
#583A1E
oklch(37.7% 0.06 62.4)
-
Step 950
950
#342212
oklch(27% 0.038 61.7)
#663F18 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) | #4B4213 | 0.053 |
| Deuteranopia (no green cones) | #544B18 | 0.047 |
| Tritanopia (no blue cones) | #703637 | 0.057 |
| Achromatopsia (no color) | #484848 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663F18
#663F18
oklch(40.6% 0.076 62.5)
- #1E4D6F
#1E4D6F
oklch(40.5% 0.077 243.3)
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 #663F18, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.026
- Chestnut #742802 ΔE 0.056
- Purple Brown #673A3F ΔE 0.059
- Green Brown #544E03 ΔE 0.060
- Olive Brown #645403 ΔE 0.066
- Milk Chocolate #7F4E1E ΔE 0.067
- Medium Brown #7F5112 ΔE 0.074
- Rust Brown #8B3103 ΔE 0.075
Use #663F18 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.