#663F47
Closest named color: Purple Brown (#673A3F). oklch(41.6% 0.056 6.4), rgb(102, 63, 71).
Aa
White text reads best on this color (8.87:1).
About this color
#663F47 is a dark, muted red. In OKLCH its lightness is 42%, its chroma 0.056 and its hue 6°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.015 away. White text reads best on it, at 8.87:1.
| Hue family | Reds |
| Lightness | dark (42%) |
| Chroma | muted (0.056) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.36:1 |
| White text | 8.87:1 |
Values
| HEX | #663F47 |
| RGB | rgb(102, 63, 71) |
| HSL | hsl(348, 24%, 32%) |
| OKLCH | oklch(41.6% 0.056 6.4) |
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 #663F47 | 8.87:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #663F47 | 2.36:1 | Fails | Lc 13.8 | Not readable |
| #663F47 text on white | 8.87:1 | AAA | Lc 90.2 | Preferred for body text |
| #663F47 text on black | 2.36:1 | 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
#E4D4D7
oklch(88.4% 0.018 4.6)
-
Step 300
300
#D4B8BD
oklch(80.8% 0.033 5.7)
-
Step 400
400
#BE949B
oklch(70.8% 0.051 7.3)
-
Step 500
500
#AD7983
oklch(63.2% 0.066 6.5)
-
Step 600
600
#98616C
oklch(55.6% 0.073 6.7)
-
Step 700
700
#81505A
oklch(49% 0.067 6.6)
-
Step 800
800 (this color)
#663F47
oklch(41.6% 0.056 6.4)
-
Step 900
900
#56383E
oklch(37.8% 0.044 6.2)
-
Step 950
950
#322124
oklch(27% 0.027 7.3)
#663F47 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) | #454647 | 0.061 |
| Deuteranopia (no green cones) | #4F4D46 | 0.056 |
| Tritanopia (no blue cones) | #6D3C42 | 0.015 |
| Achromatopsia (no color) | #4A4A4A | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663F47
#663F47
oklch(41.6% 0.056 6.4)
- #225651
#225651
oklch(41.7% 0.056 186.7)
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 #663F47, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.015
- Brownish Purple #76424E ΔE 0.035
- Charcoal Grey #3C4142 ΔE 0.076
- Mud Brown #60460F ΔE 0.083
- Chestnut #742802 ΔE 0.083
- Dark Mauve #874C62 ΔE 0.083
- Dusty Grape #545775 ΔE 0.088
- Red Brown #8B2E16 ΔE 0.089
Use #663F47 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.