#663D2D
Closest named color: Purple Brown (#673A3F). oklch(40.5% 0.064 42), rgb(102, 61, 45).
Aa
White text reads best on this color (9.24:1).
About this color
#663D2D is a dark, muted brown. In OKLCH its lightness is 41%, its chroma 0.064 and its hue 42°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.032 away. White text reads best on it, at 9.24:1.
| Hue family | Browns |
| Lightness | dark (41%) |
| Chroma | muted (0.064) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.27:1 |
| White text | 9.24:1 |
Values
| HEX | #663D2D |
| RGB | rgb(102, 61, 45) |
| HSL | hsl(17, 39%, 29%) |
| OKLCH | oklch(40.5% 0.064 42) |
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 #663D2D | 9.24:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #663D2D | 2.27:1 | Fails | Lc 12.8 | Not readable |
| #663D2D text on white | 9.24:1 | AAA | Lc 91.2 | Preferred for body text |
| #663D2D text on black | 2.27:1 | Fails | Lc -11.2 | 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 800.
-
Step 50
50
#F9F4F3
oklch(97.1% 0.006 31.1)
-
Step 100
100
#F1E8E4
oklch(93.7% 0.011 45.7)
-
Step 200
200
#E6D5CF
oklch(88.5% 0.021 40.5)
-
Step 300
300
#D7B9AE
oklch(80.9% 0.038 41.2)
-
Step 400
400
#C29584
oklch(70.8% 0.06 41.7)
-
Step 500
500
#B17A65
oklch(63% 0.076 41.7)
-
Step 600
600
#9C634C
oklch(55.6% 0.082 42.7)
-
Step 700
700
#85513D
oklch(48.9% 0.077 41.7)
-
Step 800
800 (this color)
#663D2D
oklch(40.5% 0.064 42)
-
Step 900
900
#58392D
oklch(37.8% 0.049 42)
-
Step 950
950
#34211A
oklch(27% 0.032 41)
#663D2D 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) | #48422C | 0.057 |
| Deuteranopia (no green cones) | #514B2D | 0.054 |
| Tritanopia (no blue cones) | #6F3639 | 0.034 |
| Achromatopsia (no color) | #474747 | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663D2D
#663D2D
oklch(40.5% 0.064 42)
- #185162
#185162
oklch(40.6% 0.064 221.7)
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 #663D2D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.032
- Mud Brown #60460F ΔE 0.050
- Chestnut #742802 ΔE 0.055
- Brownish Purple #76424E ΔE 0.060
- Red Brown #8B2E16 ΔE 0.076
- Milk Chocolate #7F4E1E ΔE 0.076
- Rust Brown #8B3103 ΔE 0.077
- Charcoal Grey #3C4142 ΔE 0.078
Use #663D2D 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.