#663F49
Closest named color: Purple Brown (#673A3F). oklch(41.7% 0.056 3.1), rgb(102, 63, 73).
Aa
White text reads best on this color (8.85:1).
About this color
#663F49 is a dark, muted red. In OKLCH its lightness is 42%, its chroma 0.056 and its hue 3°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.017 away. White text reads best on it, at 8.85:1.
| Hue family | Reds |
| Lightness | dark (42%) |
| Chroma | muted (0.056) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.37:1 |
| White text | 8.85:1 |
Values
| HEX | #663F49 |
| RGB | rgb(102, 63, 73) |
| HSL | hsl(345, 24%, 32%) |
| OKLCH | oklch(41.7% 0.056 3.1) |
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 #663F49 | 8.85:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #663F49 | 2.37:1 | Fails | Lc 13.8 | Not readable |
| #663F49 text on white | 8.85:1 | AAA | Lc 90.1 | Preferred for body text |
| #663F49 text on black | 2.37:1 | Fails | Lc -12.1 | 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
#F8F4F5
oklch(97.1% 0.004 360)
-
Step 100
100
#F0E7E9
oklch(93.6% 0.01 2)
-
Step 200
200
#E4D4D8
oklch(88.4% 0.018 0.4)
-
Step 300
300
#D4B8BE
oklch(80.8% 0.033 3.3)
-
Step 400
400
#BE939D
oklch(70.6% 0.053 3.1)
-
Step 500
500
#AD7985
oklch(63.2% 0.067 4)
-
Step 600
600
#98616F
oklch(55.6% 0.074 3.2)
-
Step 700
700
#81505D
oklch(49.1% 0.068 2.7)
-
Step 800
800 (this color)
#663F49
oklch(41.7% 0.056 3.1)
-
Step 900
900
#56383F
oklch(37.8% 0.044 4.1)
-
Step 950
950
#322125
oklch(27% 0.027 3.5)
#663F49 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) | #454649 | 0.061 |
| Deuteranopia (no green cones) | #4E4D48 | 0.057 |
| Tritanopia (no blue cones) | #6C3C42 | 0.015 |
| Achromatopsia (no color) | #4A4A4A | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663F49
#663F49
oklch(41.7% 0.056 3.1)
- #23564F
#23564F
oklch(41.6% 0.056 183.3)
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 #663F49, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.017
- Brownish Purple #76424E ΔE 0.034
- Charcoal Grey #3C4142 ΔE 0.077
- Dark Mauve #874C62 ΔE 0.082
- Chestnut #742802 ΔE 0.085
- Dusty Grape #545775 ΔE 0.086
- Mud Brown #60460F ΔE 0.086
- Red Brown #8B2E16 ΔE 0.091
Use #663F49 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.