#663721
Closest named color: Chestnut (#742802). oklch(39.1% 0.075 45), rgb(102, 55, 33).
Aa
White text reads best on this color (9.84:1).
About this color
#663721 is a dark, moderately saturated brown. In OKLCH its lightness is 39%, its chroma 0.075 and its hue 45°. Its hue sits on the warm side of the wheel. The nearest named color is Chestnut (#742802), ΔE 0.041 away. White text reads best on it, at 9.84:1.
| Hue family | Browns |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.075) |
| Temperature | warm |
| Nearest name | Chestnut (#742802) |
| Black text | 2.13:1 |
| White text | 9.84:1 |
Values
| HEX | #663721 |
| RGB | rgb(102, 55, 33) |
| HSL | hsl(19, 51%, 26%) |
| OKLCH | oklch(39.1% 0.075 45) |
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 #663721 | 9.84:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #663721 | 2.13:1 | Fails | Lc 11.4 | Not readable |
| #663721 text on white | 9.84:1 | AAA | Lc 92.6 | Preferred for body text |
| #663721 text on black | 2.13:1 | Fails | Lc -9.9 | 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
#F4E7E1
oklch(93.7% 0.016 46.6)
-
Step 200
200
#ECD3C8
oklch(88.5% 0.032 45.3)
-
Step 300
300
#E1B6A3
oklch(81% 0.057 45.1)
-
Step 400
400
#D08F71
oklch(70.8% 0.09 45.6)
-
Step 500
500
#C2714B
oklch(63% 0.115 45.2)
-
Step 600
600
#AE582E
oklch(55.7% 0.125 44.9)
-
Step 700
700
#954720
oklch(49% 0.117 44.8)
-
Step 800
800
#793B1D
oklch(42.7% 0.096 44.7)
-
Step 900
900 (this color)
#663721
oklch(39.1% 0.075 45)
-
Step 950
950
#391E12
oklch(26.9% 0.047 44.3)
#663721 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) | #443D1F | 0.067 |
| Deuteranopia (no green cones) | #4F4720 | 0.062 |
| Tritanopia (no blue cones) | #702E32 | 0.043 |
| Achromatopsia (no color) | #434343 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663721
#663721
oklch(39.1% 0.075 45)
- #004D63
#004D63
oklch(39.1% 0.074 225.1)
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 #663721, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chestnut #742802 ΔE 0.041
- Purple Brown #673A3F ΔE 0.042
- Mud Brown #60460F ΔE 0.052
- Reddy Brown #6E1005 ΔE 0.073
- Brownish Purple #76424E ΔE 0.074
- Red Brown #8B2E16 ΔE 0.074
- Rust Brown #8B3103 ΔE 0.075
- Blood #770001 ΔE 0.084
Use #663721 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.