#66550B
Closest named color: Olive Brown (#645403). oklch(45.4% 0.088 94.7), rgb(102, 85, 11).
Aa
White text reads best on this color (7.31:1).
About this color
#66550B is a medium-dark, moderately saturated brown. In OKLCH its lightness is 45%, its chroma 0.088 and its hue 95°. Its hue sits on the warm side of the wheel. The nearest named color is Olive Brown (#645403), ΔE 0.006 away. White text reads best on it, at 7.31:1.
| Hue family | Browns |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.088) |
| Temperature | warm |
| Nearest name | Olive Brown (#645403) |
| Black text | 2.86:1 |
| White text | 7.31:1 |
Values
| HEX | #66550B |
| RGB | rgb(102, 85, 11) |
| HSL | hsl(49, 81%, 22%) |
| OKLCH | oklch(45.4% 0.088 94.7) |
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 #66550B | 7.31:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #66550B | 2.86:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #66550B text on white | 7.31:1 | AAA | Lc 85.3 | Fine for body text |
| #66550B text on black | 2.86:1 | Fails | Lc -16.7 | Dividers and decoration only |
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
#F7F5F0
oklch(97% 0.007 88.6)
-
Step 100
100
#EDEADF
oklch(93.6% 0.015 94.2)
-
Step 200
200
#DFD9C4
oklch(88.4% 0.029 93.8)
-
Step 300
300
#CBC19B
oklch(80.9% 0.052 95)
-
Step 400
400
#B1A063
oklch(70.7% 0.083 94.3)
-
Step 500
500
#9E8835
oklch(63.1% 0.105 94.3)
-
Step 600
600
#897100
oklch(55.5% 0.114 94.1)
-
Step 700
700
#735F00
oklch(49.1% 0.101 94.6)
-
Step 800
800 (this color)
#66550B
oklch(45.4% 0.088 94.7)
-
Step 900
900
#4D410E
oklch(37.7% 0.069 95.3)
-
Step 950
950
#2D260B
oklch(27% 0.043 94.8)
#66550B 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) | #5F5300 | 0.015 |
| Deuteranopia (no green cones) | #645811 | 0.009 |
| Tritanopia (no blue cones) | #6F4D48 | 0.082 |
| Achromatopsia (no color) | #565656 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66550B
#66550B
oklch(45.4% 0.088 94.7)
- #485187
#485187
oklch(45.3% 0.089 275.1)
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 #66550B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Olive Brown #645403 ΔE 0.006
- Mud #735C12 ΔE 0.032
- Greeny Brown #696006 ΔE 0.034
- Green Brown #544E03 ΔE 0.040
- Army Green #4B5D16 ΔE 0.046
- Mud Brown #60460F ΔE 0.047
- Medium Brown #7F5112 ΔE 0.048
- Camo Green #526525 ΔE 0.051
Use #66550B 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.