#663F3D
Closest named color: Purple Brown (#673A3F). oklch(41.3% 0.055 22.9), rgb(102, 63, 61).
Aa
White text reads best on this color (8.96:1).
About this color
#663F3D is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.055 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.015 away. White text reads best on it, at 8.96:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.055) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.34:1 |
| White text | 8.96:1 |
Values
| HEX | #663F3D |
| RGB | rgb(102, 63, 61) |
| HSL | hsl(3, 25%, 32%) |
| OKLCH | oklch(41.3% 0.055 22.9) |
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 #663F3D | 8.96:1 | AAA | Lc -94.9 | Preferred for body text |
| Black text on #663F3D | 2.34:1 | Fails | Lc 13.5 | Not readable |
| #663F3D text on white | 8.96:1 | AAA | Lc 90.4 | Preferred for body text |
| #663F3D text on black | 2.34:1 | Fails | Lc -11.9 | 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 800.
-
Step 50
50
#F8F4F4
oklch(97% 0.004 17.2)
-
Step 100
100
#F0E8E7
oklch(93.7% 0.009 26)
-
Step 200
200
#E5D5D4
oklch(88.6% 0.018 21.8)
-
Step 300
300
#D5B9B7
oklch(80.9% 0.032 22.7)
-
Step 400
400
#BF9492
oklch(70.6% 0.052 21.5)
-
Step 500
500
#AE7A77
oklch(63.1% 0.066 22.8)
-
Step 600
600
#996260
oklch(55.5% 0.072 21.9)
-
Step 700
700
#83514F
oklch(49.1% 0.068 22.3)
-
Step 800
800 (this color)
#663F3D
oklch(41.3% 0.055 22.9)
-
Step 900
900
#563937
oklch(37.8% 0.042 23.6)
-
Step 950
950
#332120
oklch(27% 0.028 22.7)
#663F3D 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) | #47453D | 0.058 |
| Deuteranopia (no green cones) | #504C3C | 0.054 |
| Tritanopia (no blue cones) | #6E3A3F | 0.021 |
| Achromatopsia (no color) | #494949 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663F3D
#663F3D
oklch(41.3% 0.055 22.9)
- #205458
#205458
oklch(41.3% 0.055 202.2)
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 #663F3D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.015
- Brownish Purple #76424E ΔE 0.042
- Mud Brown #60460F ΔE 0.067
- Chestnut #742802 ΔE 0.071
- Charcoal Grey #3C4142 ΔE 0.075
- Red Brown #8B2E16 ΔE 0.082
- Milk Chocolate #7F4E1E ΔE 0.083
- Rust Brown #8B3103 ΔE 0.086
Use #663F3D 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.