#663B34
Closest named color: Purple Brown (#673A3F). oklch(40.3% 0.063 30), rgb(102, 59, 52).
Aa
White text reads best on this color (9.37:1).
About this color
#663B34 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.063 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.019 away. White text reads best on it, at 9.37:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.063) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.24:1 |
| White text | 9.37:1 |
Values
| HEX | #663B34 |
| RGB | rgb(102, 59, 52) |
| HSL | hsl(8, 32%, 30%) |
| OKLCH | oklch(40.3% 0.063 30) |
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 #663B34 | 9.37:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #663B34 | 2.24:1 | Fails | Lc 12.5 | Not readable |
| #663B34 text on white | 9.37:1 | AAA | Lc 91.5 | Preferred for body text |
| #663B34 text on black | 2.24:1 | Fails | Lc -10.9 | 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
#F9F4F3
oklch(97.1% 0.006 31.1)
-
Step 100
100
#F1E7E6
oklch(93.6% 0.011 24.3)
-
Step 200
200
#E6D4D1
oklch(88.4% 0.02 28.9)
-
Step 300
300
#D7B8B3
oklch(80.8% 0.037 28.7)
-
Step 400
400
#C2938B
oklch(70.6% 0.058 29.6)
-
Step 500
500
#B2786F
oklch(63% 0.075 29.1)
-
Step 600
600
#9D6157
oklch(55.6% 0.08 30.1)
-
Step 700
700
#865047
oklch(49.1% 0.075 30.2)
-
Step 800
800 (this color)
#663B34
oklch(40.3% 0.063 30)
-
Step 900
900
#593832
oklch(37.8% 0.049 30.8)
-
Step 950
950
#34211D
oklch(27% 0.031 32.3)
#663B34 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) | #454133 | 0.063 |
| Deuteranopia (no green cones) | #4F4A33 | 0.059 |
| Tritanopia (no blue cones) | #6E3539 | 0.025 |
| Achromatopsia (no color) | #464646 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663B34
#663B34
oklch(40.3% 0.063 30)
- #12515B
#12515B
oklch(40.1% 0.063 210.6)
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 #663B34, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.019
- Brownish Purple #76424E ΔE 0.053
- Chestnut #742802 ΔE 0.058
- Mud Brown #60460F ΔE 0.063
- Charcoal Grey #3C4142 ΔE 0.076
- Red Brown #8B2E16 ΔE 0.077
- Rust Brown #8B3103 ΔE 0.081
- Milk Chocolate #7F4E1E ΔE 0.084
Use #663B34 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.