#663003
Closest named color: Chestnut (#742802). oklch(37.5% 0.093 52.7), rgb(102, 48, 3).
Aa
White text reads best on this color (10.55:1).
About this color
#663003 is a dark, moderately saturated brown. In OKLCH its lightness is 38%, its chroma 0.093 and its hue 53°. Its hue sits on the warm side of the wheel. The nearest named color is Chestnut (#742802), ΔE 0.032 away. White text reads best on it, at 10.55:1.
| Hue family | Browns |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.093) |
| Temperature | warm |
| Nearest name | Chestnut (#742802) |
| Black text | 1.98:1 |
| White text | 10.55:1 |
Values
| HEX | #663003 |
| RGB | rgb(102, 48, 3) |
| HSL | hsl(27, 94%, 21%) |
| OKLCH | oklch(37.5% 0.093 52.7) |
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 #663003 | 10.55:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #663003 | 1.98:1 | Fails | Lc 9.9 | Not readable |
| #663003 text on white | 10.55:1 | AAA | Lc 94.0 | Preferred for body text |
| #663003 text on black | 1.98:1 | Fails | Lc -8.5 | 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
#FBF4F0
oklch(97.1% 0.009 52.1)
-
Step 100
100
#F5E7DE
oklch(93.7% 0.02 55.1)
-
Step 200
200
#EFD3C2
oklch(88.6% 0.039 53.3)
-
Step 300
300
#E6B597
oklch(81% 0.07 52.9)
-
Step 400
400
#D78C5C
oklch(70.7% 0.112 52.6)
-
Step 500
500
#CB6D27
oklch(63.2% 0.143 52.6)
-
Step 600
600
#B15600
oklch(55.5% 0.142 52.5)
-
Step 700
700
#964800
oklch(49.2% 0.125 52.6)
-
Step 800
800
#7B3A00
oklch(42.6% 0.109 52.7)
-
Step 900
900 (this color)
#663003
oklch(37.5% 0.093 52.7)
-
Step 950
950
#3C1D07
oklch(27% 0.058 52.7)
#663003 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) | #403700 | 0.078 |
| Deuteranopia (no green cones) | #4D4402 | 0.072 |
| Tritanopia (no blue cones) | #712428 | 0.057 |
| Achromatopsia (no color) | #3F3F3F | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663003
#663003
oklch(37.5% 0.093 52.7)
- #004763
#004763
oklch(37.4% 0.077 233.1)
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 #663003, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chestnut #742802 ΔE 0.032
- Mud Brown #60460F ΔE 0.058
- Reddy Brown #6E1005 ΔE 0.061
- Purple Brown #673A3F ΔE 0.067
- Blood #770001 ΔE 0.074
- Rust Brown #8B3103 ΔE 0.078
- Maroon #800000 ΔE 0.078
- Red Brown #8B2E16 ΔE 0.080
Use #663003 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.