#663906
Closest named color: Mud Brown (#60460F). oklch(39.2% 0.087 61.6), rgb(102, 57, 6).
Aa
White text reads best on this color (9.75:1).
About this color
#663906 is a dark, moderately saturated brown. In OKLCH its lightness is 39%, its chroma 0.087 and its hue 62°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.036 away. White text reads best on it, at 9.75:1.
| Hue family | Browns |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.087) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.15:1 |
| White text | 9.75:1 |
Values
| HEX | #663906 |
| RGB | rgb(102, 57, 6) |
| HSL | hsl(32, 89%, 21%) |
| OKLCH | oklch(39.2% 0.087 61.6) |
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 #663906 | 9.75:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #663906 | 2.15:1 | Fails | Lc 11.7 | Not readable |
| #663906 text on white | 9.75:1 | AAA | Lc 92.3 | Preferred for body text |
| #663906 text on black | 2.15:1 | Fails | Lc -10.1 | 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
#F4E7DD
oklch(93.6% 0.02 60.2)
-
Step 200
200
#EBD4C2
oklch(88.4% 0.035 60.4)
-
Step 300
300
#E0B896
oklch(80.9% 0.065 62.1)
-
Step 400
400
#CF915A
oklch(70.6% 0.104 61.5)
-
Step 500
500
#C27422
oklch(63.1% 0.133 61.3)
-
Step 600
600
#A75F00
oklch(55.6% 0.128 62.1)
-
Step 700
700
#8D4F00
oklch(49.1% 0.113 61.8)
-
Step 800
800
#744000
oklch(42.6% 0.098 61.8)
-
Step 900
900 (this color)
#663906
oklch(39.2% 0.087 61.6)
-
Step 950
950
#391F06
oklch(26.9% 0.055 60.7)
#663906 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) | #473E00 | 0.062 |
| Deuteranopia (no green cones) | #524806 | 0.055 |
| Tritanopia (no blue cones) | #702F30 | 0.062 |
| Achromatopsia (no color) | #444444 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663906
#663906
oklch(39.2% 0.087 61.6)
- #0B4A70
#0B4A70
oklch(39.2% 0.087 242.1)
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 #663906, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.036
- Chestnut #742802 ΔE 0.046
- Purple Brown #673A3F ΔE 0.066
- Green Brown #544E03 ΔE 0.068
- Rust Brown #8B3103 ΔE 0.075
- Olive Brown #645403 ΔE 0.077
- Milk Chocolate #7F4E1E ΔE 0.079
- Red Brown #8B2E16 ΔE 0.080
Use #663906 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.