#66331D
Closest named color: Chestnut (#742802). oklch(38.3% 0.081 43.1), rgb(102, 51, 29).
Aa
White text reads best on this color (10.21:1).
About this color
#66331D is a dark, moderately saturated brown. In OKLCH its lightness is 38%, its chroma 0.081 and its hue 43°. Its hue sits on the warm side of the wheel. The nearest named color is Chestnut (#742802), ΔE 0.035 away. White text reads best on it, at 10.21:1.
| Hue family | Browns |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.081) |
| Temperature | warm |
| Nearest name | Chestnut (#742802) |
| Black text | 2.05:1 |
| White text | 10.21:1 |
Values
| HEX | #66331D |
| RGB | rgb(102, 51, 29) |
| HSL | hsl(18, 56%, 26%) |
| OKLCH | oklch(38.3% 0.081 43.1) |
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 #66331D | 10.21:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #66331D | 2.05:1 | Fails | Lc 10.6 | Not readable |
| #66331D text on white | 10.21:1 | AAA | Lc 93.4 | Preferred for body text |
| #66331D text on black | 2.05:1 | Fails | Lc -9.1 | Not readable |
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 900.
-
Step 50
50
#FBF4F1
oklch(97.2% 0.009 44.9)
-
Step 100
100
#F5E6E1
oklch(93.5% 0.018 39.4)
-
Step 200
200
#EDD3C8
oklch(88.5% 0.033 44.3)
-
Step 300
300
#E3B5A2
oklch(80.9% 0.06 43.6)
-
Step 400
400
#D48C6F
oklch(70.6% 0.097 42.7)
-
Step 500
500
#C76E48
oklch(63.1% 0.124 43.2)
-
Step 600
600
#B2542A
oklch(55.6% 0.134 42.9)
-
Step 700
700
#99441C
oklch(49.1% 0.125 43.2)
-
Step 800
800
#7C381A
oklch(42.6% 0.104 42.7)
-
Step 900
900 (this color)
#66331D
oklch(38.3% 0.081 43.1)
-
Step 950
950
#3B1D11
oklch(26.9% 0.052 42.1)
#66331D 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) | #413A1B | 0.074 |
| Deuteranopia (no green cones) | #4D451C | 0.068 |
| Tritanopia (no blue cones) | #70292E | 0.043 |
| Achromatopsia (no color) | #414141 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66331D
#66331D
oklch(38.3% 0.081 43.1)
- #004B5F
#004B5F
oklch(38.3% 0.072 223.3)
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 #66331D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chestnut #742802 ΔE 0.035
- Purple Brown #673A3F ΔE 0.046
- Mud Brown #60460F ΔE 0.059
- Reddy Brown #6E1005 ΔE 0.063
- Red Brown #8B2E16 ΔE 0.075
- Blood #770001 ΔE 0.076
- Rust Brown #8B3103 ΔE 0.076
- Maroon #800000 ΔE 0.079
Use #66331D 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.