#66631B
Closest named color: Greeny Brown (#696006). oklch(48.8% 0.091 107), rgb(102, 99, 27).
Aa
White text reads best on this color (6.23:1).
About this color
#66631B is a medium-dark, moderately saturated brown. In OKLCH its lightness is 49%, its chroma 0.091 and its hue 107°. Its hue sits on the warm side of the wheel. The nearest named color is Greeny Brown (#696006), ΔE 0.012 away. White text reads best on it, at 6.23:1.
| Hue family | Browns |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.091) |
| Temperature | warm |
| Nearest name | Greeny Brown (#696006) |
| Black text | 3.36:1 |
| White text | 6.23:1 |
Values
| HEX | #66631B |
| RGB | rgb(102, 99, 27) |
| HSL | hsl(58, 58%, 25%) |
| OKLCH | oklch(48.8% 0.091 107) |
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 #66631B | 6.23:1 | AA | Lc -86.2 | Fine for body text |
| Black text on #66631B | 3.36:1 | AA large text | Lc 23.0 | Dividers and decoration only |
| #66631B text on white | 6.23:1 | AA | Lc 81.0 | Fine for body text |
| #66631B text on black | 3.36:1 | AA large text | Lc -20.8 | 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 700.
-
Step 50
50
#F6F6F1
oklch(97.2% 0.007 106.5)
-
Step 100
100
#EAEBE1
oklch(93.7% 0.013 111.3)
-
Step 200
200
#DBDBC8
oklch(88.6% 0.025 106.9)
-
Step 300
300
#C3C3A2
oklch(80.9% 0.045 107.4)
-
Step 400
400
#A5A470
oklch(70.7% 0.071 107.1)
-
Step 500
500
#908D49
oklch(63.1% 0.09 106.5)
-
Step 600
600
#7A772A
oklch(55.6% 0.098 107.1)
-
Step 700
700 (this color)
#66631B
oklch(48.8% 0.091 107)
-
Step 800
800
#54521A
oklch(42.8% 0.076 107.3)
-
Step 900
900
#45441C
oklch(37.8% 0.059 107.6)
-
Step 950
950
#282811
oklch(27% 0.038 108.7)
#66631B 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) | #6C5F10 | 0.014 |
| Deuteranopia (no green cones) | #6D6220 | 0.013 |
| Tritanopia (no blue cones) | #6E5C55 | 0.084 |
| Achromatopsia (no color) | #616161 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66631B
#66631B
oklch(48.8% 0.091 107)
- #5D5791
#5D5791
oklch(48.8% 0.092 287.2)
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 #66631B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Brown #696006 ΔE 0.012
- Mud Green #606602 ΔE 0.021
- Mud #735C12 ΔE 0.027
- Camo Green #526525 ΔE 0.029
- Dark Olive Green #556B2F ΔE 0.031
- Dark Moss Green #606C38 ΔE 0.031
- Brown Green #706C11 ΔE 0.034
- Browny Green #6F6C0A ΔE 0.034
Use #66631B 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.