#66531D
Closest named color: Olive Brown (#645403). oklch(45% 0.076 89.4), rgb(102, 83, 29).
Aa
White text reads best on this color (7.44:1).
About this color
#66531D is a medium-dark, moderately saturated brown. In OKLCH its lightness is 45%, its chroma 0.076 and its hue 89°. Its hue sits on the warm side of the wheel. The nearest named color is Olive Brown (#645403), ΔE 0.018 away. White text reads best on it, at 7.44:1.
| Hue family | Browns |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.076) |
| Temperature | warm |
| Nearest name | Olive Brown (#645403) |
| Black text | 2.82:1 |
| White text | 7.44:1 |
Values
| HEX | #66531D |
| RGB | rgb(102, 83, 29) |
| HSL | hsl(44, 56%, 26%) |
| OKLCH | oklch(45% 0.076 89.4) |
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 #66531D | 7.44:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #66531D | 2.82:1 | Fails | Lc 18.2 | Dividers and decoration only |
| #66531D text on white | 7.44:1 | AAA | Lc 85.8 | Fine for body text |
| #66531D text on black | 2.82:1 | Fails | Lc -16.3 | 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
#F7F5F1
oklch(97.1% 0.006 84.6)
-
Step 100
100
#EDEAE0
oklch(93.7% 0.014 93)
-
Step 200
200
#DFD9C7
oklch(88.5% 0.025 91.6)
-
Step 300
300
#CCC0A1
oklch(81% 0.044 89.4)
-
Step 400
400
#B29F6D
oklch(70.7% 0.071 89.6)
-
Step 500
500
#9F8745
oklch(63.1% 0.09 89.7)
-
Step 600
600
#8A7024
oklch(55.6% 0.098 89.5)
-
Step 700
700
#755E16
oklch(49.2% 0.091 90)
-
Step 800
800 (this color)
#66531D
oklch(45% 0.076 89.4)
-
Step 900
900
#4E4019
oklch(37.7% 0.059 89.5)
-
Step 950
950
#2E2610
oklch(27.2% 0.037 89.8)
#66531D 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) | #5D5216 | 0.018 |
| Deuteranopia (no green cones) | #61571F | 0.014 |
| Tritanopia (no blue cones) | #6F4C48 | 0.069 |
| Achromatopsia (no color) | #555555 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66531D
#66531D
oklch(45% 0.076 89.4)
- #445380
#445380
oklch(45% 0.076 269.2)
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 #66531D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Olive Brown #645403 ΔE 0.018
- Mud #735C12 ΔE 0.038
- Mud Brown #60460F ΔE 0.040
- Green Brown #544E03 ΔE 0.041
- Medium Brown #7F5112 ΔE 0.045
- Greeny Brown #696006 ΔE 0.045
- Milk Chocolate #7F4E1E ΔE 0.047
- Army Green #4B5D16 ΔE 0.054
Use #66531D 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.