#663307
Closest named color: Chestnut (#742802). oklch(38.1% 0.09 54.4), rgb(102, 51, 7).
Aa
White text reads best on this color (10.28:1).
About this color
#663307 is a dark, moderately saturated brown. In OKLCH its lightness is 38%, its chroma 0.090 and its hue 54°. 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 10.28:1.
| Hue family | Browns |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.090) |
| Temperature | warm |
| Nearest name | Chestnut (#742802) |
| Black text | 2.04:1 |
| White text | 10.28:1 |
Values
| HEX | #663307 |
| RGB | rgb(102, 51, 7) |
| HSL | hsl(28, 87%, 21%) |
| OKLCH | oklch(38.1% 0.09 54.4) |
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 #663307 | 10.28:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #663307 | 2.04:1 | Fails | Lc 10.5 | Not readable |
| #663307 text on white | 10.28:1 | AAA | Lc 93.5 | Preferred for body text |
| #663307 text on black | 2.04:1 | Fails | Lc -9.0 | 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
#EED3C2
oklch(88.5% 0.038 54.3)
-
Step 300
300
#E4B698
oklch(81% 0.067 54.7)
-
Step 400
400
#D58E5D
oklch(70.8% 0.108 54.7)
-
Step 500
500
#C86F2A
oklch(63.1% 0.138 54.1)
-
Step 600
600
#AF5800
oklch(55.6% 0.139 54.3)
-
Step 700
700
#944A00
oklch(49.2% 0.122 54.7)
-
Step 800
800
#7A3B00
oklch(42.6% 0.107 54)
-
Step 900
900 (this color)
#663307
oklch(38.1% 0.09 54.4)
-
Step 950
950
#3B1E07
oklch(27% 0.057 55.6)
#663307 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) | #423900 | 0.074 |
| Deuteranopia (no green cones) | #4E4506 | 0.067 |
| Tritanopia (no blue cones) | #71272B | 0.059 |
| Achromatopsia (no color) | #414141 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663307
#663307
oklch(38.1% 0.09 54.4)
- #004967
#004967
oklch(38.2% 0.08 234.3)
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 #663307, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chestnut #742802 ΔE 0.035
- Mud Brown #60460F ΔE 0.051
- Purple Brown #673A3F ΔE 0.064
- Reddy Brown #6E1005 ΔE 0.067
- Rust Brown #8B3103 ΔE 0.076
- Red Brown #8B2E16 ΔE 0.078
- Blood #770001 ΔE 0.080
- Green Brown #544E03 ΔE 0.083
Use #663307 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.