#663B2D
Closest named color: Purple Brown (#673A3F). oklch(40.1% 0.065 38.8), rgb(102, 59, 45).
Aa
White text reads best on this color (9.42:1).
About this color
#663B2D is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.065 and its hue 39°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.029 away. White text reads best on it, at 9.42:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.065) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.22:1 |
| White text | 9.42:1 |
Values
| HEX | #663B2D |
| RGB | rgb(102, 59, 45) |
| HSL | hsl(15, 39%, 29%) |
| OKLCH | oklch(40.1% 0.065 38.8) |
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 #663B2D | 9.42:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #663B2D | 2.22:1 | Fails | Lc 12.4 | Not readable |
| #663B2D text on white | 9.42:1 | AAA | Lc 91.6 | Preferred for body text |
| #663B2D text on black | 2.22:1 | Fails | Lc -10.8 | 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
#FAF4F2
oklch(97.1% 0.007 39.5)
-
Step 100
100
#F3E7E3
oklch(93.6% 0.014 39.4)
-
Step 200
200
#EAD4CC
oklch(88.6% 0.027 41.1)
-
Step 300
300
#DEB6AA
oklch(80.8% 0.05 37.3)
-
Step 400
400
#CC907C
oklch(70.7% 0.079 39.2)
-
Step 500
500
#BD735B
oklch(63% 0.1 38.7)
-
Step 600
600
#A85B41
oklch(55.6% 0.108 39.3)
-
Step 700
700
#904A33
oklch(49% 0.101 38.8)
-
Step 800
800
#753D2B
oklch(42.6% 0.084 38.5)
-
Step 900
900 (this color)
#663B2D
oklch(40.1% 0.065 38.8)
-
Step 950
950
#381F17
oklch(27% 0.042 38.5)
#663B2D 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) | #46412C | 0.061 |
| Deuteranopia (no green cones) | #504A2D | 0.058 |
| Tritanopia (no blue cones) | #6F3437 | 0.032 |
| Achromatopsia (no color) | #464646 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663B2D
#663B2D
oklch(40.1% 0.065 38.8)
- #115060
#115060
oklch(40.1% 0.066 219.3)
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 #663B2D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.029
- Chestnut #742802 ΔE 0.053
- Mud Brown #60460F ΔE 0.054
- Brownish Purple #76424E ΔE 0.060
- Red Brown #8B2E16 ΔE 0.075
- Rust Brown #8B3103 ΔE 0.077
- Charcoal Grey #3C4142 ΔE 0.078
- Milk Chocolate #7F4E1E ΔE 0.080
Use #663B2D 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.