#663B30
Closest named color: Purple Brown (#673A3F). oklch(40.2% 0.064 35.2), rgb(102, 59, 48).
Aa
White text reads best on this color (9.40:1).
About this color
#663B30 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.064 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.025 away. White text reads best on it, at 9.40:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.064) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.23:1 |
| White text | 9.40:1 |
Values
| HEX | #663B30 |
| RGB | rgb(102, 59, 48) |
| HSL | hsl(12, 36%, 29%) |
| OKLCH | oklch(40.2% 0.064 35.2) |
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 #663B30 | 9.40:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #663B30 | 2.23:1 | Fails | Lc 12.4 | Not readable |
| #663B30 text on white | 9.40:1 | AAA | Lc 91.5 | Preferred for body text |
| #663B30 text on black | 2.23:1 | 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
#F3E7E4
oklch(93.7% 0.014 34.3)
-
Step 200
200
#EAD3CD
oklch(88.4% 0.027 35)
-
Step 300
300
#DEB6AC
oklch(80.9% 0.049 34.4)
-
Step 400
400
#CC9080
oklch(70.8% 0.077 35.5)
-
Step 500
500
#BD7360
oklch(63.1% 0.098 35.2)
-
Step 600
600
#A85A47
oklch(55.5% 0.107 34.7)
-
Step 700
700
#904A38
oklch(49.1% 0.099 35.4)
-
Step 800
800
#753D2F
oklch(42.7% 0.082 35)
-
Step 900
900 (this color)
#663B30
oklch(40.2% 0.064 35.2)
-
Step 950
950
#381F19
oklch(27.1% 0.041 34.3)
#663B30 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) | #45412F | 0.063 |
| Deuteranopia (no green cones) | #504A2F | 0.058 |
| Tritanopia (no blue cones) | #6F3438 | 0.030 |
| Achromatopsia (no color) | #464646 | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663B30
#663B30
oklch(40.2% 0.064 35.2)
- #12515E
#12515E
oklch(40.3% 0.064 215)
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 #663B30, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.025
- Chestnut #742802 ΔE 0.055
- Brownish Purple #76424E ΔE 0.057
- Mud Brown #60460F ΔE 0.058
- Red Brown #8B2E16 ΔE 0.076
- Charcoal Grey #3C4142 ΔE 0.077
- Rust Brown #8B3103 ΔE 0.078
- Milk Chocolate #7F4E1E ΔE 0.082
Use #663B30 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.