#663B0B
Closest named color: Mud Brown (#60460F). oklch(39.7% 0.084 62.5), rgb(102, 59, 11).
Aa
White text reads best on this color (9.56:1).
About this color
#663B0B is a dark, moderately saturated brown. In OKLCH its lightness is 40%, its chroma 0.084 and its hue 63°. Its hue sits on the warm side of the wheel. The nearest named color is Mud Brown (#60460F), ΔE 0.031 away. White text reads best on it, at 9.56:1.
| Hue family | Browns |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.084) |
| Temperature | warm |
| Nearest name | Mud Brown (#60460F) |
| Black text | 2.19:1 |
| White text | 9.56:1 |
Values
| HEX | #663B0B |
| RGB | rgb(102, 59, 11) |
| HSL | hsl(32, 81%, 22%) |
| OKLCH | oklch(39.7% 0.084 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 #663B0B | 9.56:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #663B0B | 2.19:1 | Fails | Lc 12.1 | Not readable |
| #663B0B text on white | 9.56:1 | AAA | Lc 91.9 | Preferred for body text |
| #663B0B text on black | 2.19:1 | Fails | Lc -10.5 | 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
#F3E7DE
oklch(93.5% 0.018 59.5)
-
Step 200
200
#EBD5C2
oklch(88.6% 0.035 63.2)
-
Step 300
300
#DFB897
oklch(80.9% 0.063 62)
-
Step 400
400
#CD925C
oklch(70.6% 0.1 62.5)
-
Step 500
500
#BF7626
oklch(63.1% 0.128 63.2)
-
Step 600
600
#A65F00
oklch(55.5% 0.127 62.5)
-
Step 700
700
#8C5000
oklch(49.1% 0.112 63.2)
-
Step 800
800
#744100
oklch(42.8% 0.098 62.8)
-
Step 900
900 (this color)
#663B0B
oklch(39.7% 0.084 62.5)
-
Step 950
950
#392007
oklch(27.1% 0.053 62)
#663B0B 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) | #483F03 | 0.060 |
| Deuteranopia (no green cones) | #53490C | 0.052 |
| Tritanopia (no blue cones) | #703132 | 0.062 |
| Achromatopsia (no color) | #454545 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663B0B
#663B0B
oklch(39.7% 0.084 62.5)
- #134B70
#134B70
oklch(39.7% 0.084 242.8)
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 #663B0B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud Brown #60460F ΔE 0.031
- Chestnut #742802 ΔE 0.049
- Green Brown #544E03 ΔE 0.064
- Purple Brown #673A3F ΔE 0.065
- Olive Brown #645403 ΔE 0.073
- Milk Chocolate #7F4E1E ΔE 0.075
- Rust Brown #8B3103 ΔE 0.075
- Red Brown #8B2E16 ΔE 0.079
Use #663B0B 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.