#66391C
Closest named color: Chestnut (#742802). oklch(39.4% 0.076 51.6), rgb(102, 57, 28).
Aa
White text reads best on this color (9.69:1).
About this color
#66391C is a dark, moderately saturated brown. In OKLCH its lightness is 39%, its chroma 0.076 and its hue 52°. Its hue sits on the warm side of the wheel. The nearest named color is Chestnut (#742802), ΔE 0.043 away. White text reads best on it, at 9.69:1.
| Hue family | Browns |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.076) |
| Temperature | warm |
| Nearest name | Chestnut (#742802) |
| Black text | 2.16:1 |
| White text | 9.69:1 |
Values
| HEX | #66391C |
| RGB | rgb(102, 57, 28) |
| HSL | hsl(24, 57%, 25%) |
| OKLCH | oklch(39.4% 0.076 51.6) |
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 #66391C | 9.69:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #66391C | 2.16:1 | Fails | Lc 11.8 | Not readable |
| #66391C text on white | 9.69:1 | AAA | Lc 92.2 | Preferred for body text |
| #66391C text on black | 2.16:1 | Fails | Lc -10.2 | 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
#F3E7E0
oklch(93.6% 0.016 52.6)
-
Step 200
200
#EBD4C6
oklch(88.5% 0.032 53.5)
-
Step 300
300
#E0B79F
oklch(81% 0.058 52)
-
Step 400
400
#CF906B
oklch(70.7% 0.092 51.2)
-
Step 500
500
#C17342
oklch(63.1% 0.118 51.3)
-
Step 600
600
#AC5A20
oklch(55.6% 0.127 51.5)
-
Step 700
700
#944911
oklch(49.1% 0.119 51.1)
-
Step 800
800
#783D12
oklch(42.8% 0.098 52)
-
Step 900
900 (this color)
#66391C
oklch(39.4% 0.076 51.6)
-
Step 950
950
#391F0F
oklch(27% 0.048 51.1)
#66391C 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) | #463E19 | 0.063 |
| Deuteranopia (no green cones) | #51481C | 0.057 |
| Tritanopia (no blue cones) | #703032 | 0.047 |
| Achromatopsia (no color) | #444444 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66391C
#66391C
oklch(39.4% 0.076 51.6)
- #084D68
#084D68
oklch(39.5% 0.077 231.5)
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 #66391C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chestnut #742802 ΔE 0.043
- Mud Brown #60460F ΔE 0.043
- Purple Brown #673A3F ΔE 0.049
- Rust Brown #8B3103 ΔE 0.074
- Red Brown #8B2E16 ΔE 0.075
- Green Brown #544E03 ΔE 0.076
- Brownish Purple #76424E ΔE 0.078
- Reddy Brown #6E1005 ΔE 0.078
Use #66391C 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.