#66583B
Closest named color: Mud (#735C12). oklch(46.6% 0.047 84.9), rgb(102, 88, 59).
Aa
White text reads best on this color (6.94:1).
About this color
#66583B is a medium-dark, muted brown. In OKLCH its lightness is 47%, its chroma 0.047 and its hue 85°. Its hue sits on the warm side of the wheel. The nearest named color is Mud (#735C12), ΔE 0.049 away. White text reads best on it, at 6.94:1.
| Hue family | Browns |
| Lightness | medium-dark (47%) |
| Chroma | muted (0.047) |
| Temperature | warm |
| Nearest name | Mud (#735C12) |
| Black text | 3.02:1 |
| White text | 6.94:1 |
Values
| HEX | #66583B |
| RGB | rgb(102, 88, 59) |
| HSL | hsl(40, 27%, 32%) |
| OKLCH | oklch(46.6% 0.047 84.9) |
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 #66583B | 6.94:1 | AA | Lc -89.0 | Fine for body text |
| Black text on #66583B | 3.02:1 | AA large text | Lc 20.0 | Dividers and decoration only |
| #66583B text on white | 6.94:1 | AA | Lc 84.0 | Fine for body text |
| #66583B text on black | 3.02:1 | AA large text | Lc -18.0 | 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
#F6F5F3
oklch(97% 0.003 84.6)
-
Step 100
100
#ECEAE5
oklch(93.7% 0.007 88.6)
-
Step 200
200
#DDD9D0
oklch(88.6% 0.013 86.8)
-
Step 300
300
#C7C0B0
oklch(80.9% 0.023 87.2)
-
Step 400
400
#AB9F87
oklch(70.6% 0.036 84.6)
-
Step 500
500
#96886A
oklch(63.1% 0.046 85.9)
-
Step 600
600
#817151
oklch(55.5% 0.05 84.3)
-
Step 700
700 (this color)
#66583B
oklch(46.6% 0.047 84.9)
-
Step 800
800
#594E36
oklch(42.8% 0.04 86.1)
-
Step 900
900
#49412F
oklch(37.8% 0.031 86.8)
-
Step 950
950
#2B261C
oklch(27.1% 0.019 84.5)
#66583B 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) | #5F5739 | 0.013 |
| Deuteranopia (no green cones) | #625B3C | 0.010 |
| Tritanopia (no blue cones) | #6D5351 | 0.043 |
| Achromatopsia (no color) | #5A5A5A | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66583B
#66583B
oklch(46.6% 0.047 84.9)
- #4D5A75
#4D5A75
oklch(46.7% 0.047 264.6)
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 #66583B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mud #735C12 ΔE 0.049
- Olive Brown #645403 ΔE 0.049
- Milk Chocolate #7F4E1E ΔE 0.051
- Medium Brown #7F5112 ΔE 0.053
- Greeny Brown #696006 ΔE 0.059
- Mud Brown #60460F ΔE 0.062
- Dark Moss Green #606C38 ΔE 0.062
- Camo Green #526525 ΔE 0.064
Use #66583B 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.