#66511E
Closest named color: Olive Brown (#645403). oklch(44.6% 0.074 86.4), rgb(102, 81, 30).
Aa
White text reads best on this color (7.60:1).
About this color
#66511E is a dark, moderately saturated brown. In OKLCH its lightness is 45%, its chroma 0.074 and its hue 86°. Its hue sits on the warm side of the wheel. The nearest named color is Olive Brown (#645403), ΔE 0.022 away. White text reads best on it, at 7.60:1.
| Hue family | Browns |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.074) |
| Temperature | warm |
| Nearest name | Olive Brown (#645403) |
| Black text | 2.76:1 |
| White text | 7.60:1 |
Values
| HEX | #66511E |
| RGB | rgb(102, 81, 30) |
| HSL | hsl(42, 55%, 26%) |
| OKLCH | oklch(44.6% 0.074 86.4) |
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 #66511E | 7.60:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #66511E | 2.76:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #66511E text on white | 7.60:1 | AAA | Lc 86.3 | Fine for body text |
| #66511E text on black | 2.76:1 | Fails | Lc -15.7 | 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
#F7F5F1
oklch(97.1% 0.006 84.6)
-
Step 100
100
#EDE9E1
oklch(93.5% 0.012 84.6)
-
Step 200
200
#E0D8C8
oklch(88.4% 0.023 84.6)
-
Step 300
300
#CDBFA2
oklch(80.9% 0.042 85.3)
-
Step 400
400
#B39E6F
oklch(70.6% 0.068 86.6)
-
Step 500
500
#A18647
oklch(63.2% 0.088 86.6)
-
Step 600
600
#8C6F27
oklch(55.6% 0.096 86.4)
-
Step 700
700
#775D1A
oklch(49.2% 0.089 86.6)
-
Step 800
800 (this color)
#66511E
oklch(44.6% 0.074 86.4)
-
Step 900
900
#4F3F1B
oklch(37.6% 0.057 85.5)
-
Step 950
950
#2E2510
oklch(26.9% 0.037 86.7)
#66511E 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) | #5B5018 | 0.022 |
| Deuteranopia (no green cones) | #605620 | 0.017 |
| Tritanopia (no blue cones) | #6F4A46 | 0.066 |
| Achromatopsia (no color) | #545454 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66511E
#66511E
oklch(44.6% 0.074 86.4)
- #41537D
#41537D
oklch(44.6% 0.073 265.8)
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 #66511E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Olive Brown #645403 ΔE 0.022
- Mud Brown #60460F ΔE 0.034
- Green Brown #544E03 ΔE 0.040
- Mud #735C12 ΔE 0.043
- Medium Brown #7F5112 ΔE 0.046
- Milk Chocolate #7F4E1E ΔE 0.046
- Greeny Brown #696006 ΔE 0.051
- Army Green #4B5D16 ΔE 0.058
Use #66511E 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.