#66371C
Closest named color: Chestnut (#742802). oklch(39% 0.078 48.9), rgb(102, 55, 28).
Aa
White text reads best on this color (9.86:1).
About this color
#66371C is a dark, moderately saturated brown. In OKLCH its lightness is 39%, its chroma 0.078 and its hue 49°. Its hue sits on the warm side of the wheel. The nearest named color is Chestnut (#742802), ΔE 0.040 away. White text reads best on it, at 9.86:1.
| Hue family | Browns |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.078) |
| Temperature | warm |
| Nearest name | Chestnut (#742802) |
| Black text | 2.12:1 |
| White text | 9.86:1 |
Values
| HEX | #66371C |
| RGB | rgb(102, 55, 28) |
| HSL | hsl(22, 57%, 25%) |
| OKLCH | oklch(39% 0.078 48.9) |
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 #66371C | 9.86:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #66371C | 2.12:1 | Fails | Lc 11.3 | Not readable |
| #66371C text on white | 9.86:1 | AAA | Lc 92.6 | Preferred for body text |
| #66371C text on black | 2.12:1 | Fails | Lc -9.8 | 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
#FAF4F1
oklch(97.1% 0.008 48.7)
-
Step 100
100
#F4E7E0
oklch(93.6% 0.017 50.4)
-
Step 200
200
#ECD3C7
oklch(88.4% 0.032 47.3)
-
Step 300
300
#E1B6A0
oklch(80.9% 0.059 48.5)
-
Step 400
400
#D08F6C
oklch(70.7% 0.093 49)
-
Step 500
500
#C37244
oklch(63.2% 0.119 49)
-
Step 600
600
#AE5822
oklch(55.6% 0.13 49)
-
Step 700
700
#954814
oklch(49.1% 0.12 49.4)
-
Step 800
800
#793B14
oklch(42.6% 0.1 48.9)
-
Step 900
900 (this color)
#66371C
oklch(39% 0.078 48.9)
-
Step 950
950
#3A1E0F
oklch(27% 0.05 47.8)
#66371C 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) | #443D19 | 0.067 |
| Deuteranopia (no green cones) | #4F471C | 0.061 |
| Tritanopia (no blue cones) | #702E31 | 0.046 |
| Achromatopsia (no color) | #434343 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66371C
#66371C
oklch(39% 0.078 48.9)
- #004C66
#004C66
oklch(39% 0.077 229.6)
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 #66371C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chestnut #742802 ΔE 0.040
- Purple Brown #673A3F ΔE 0.048
- Mud Brown #60460F ΔE 0.049
- Reddy Brown #6E1005 ΔE 0.073
- Rust Brown #8B3103 ΔE 0.074
- Red Brown #8B2E16 ΔE 0.075
- Brownish Purple #76424E ΔE 0.078
- Green Brown #544E03 ΔE 0.081
Use #66371C 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.