#663E4B
Closest named color: Purple Brown (#673A3F). oklch(41.5% 0.059 359), rgb(102, 62, 75).
Aa
White text reads best on this color (8.91:1).
About this color
#663E4B is a dark, muted red. In OKLCH its lightness is 42%, its chroma 0.059 and its hue 359°. 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 8.91:1.
| Hue family | Reds |
| Lightness | dark (42%) |
| Chroma | muted (0.059) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.35:1 |
| White text | 8.91:1 |
Values
| HEX | #663E4B |
| RGB | rgb(102, 62, 75) |
| HSL | hsl(341, 24%, 32%) |
| OKLCH | oklch(41.5% 0.059 359) |
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 #663E4B | 8.91:1 | AAA | Lc -94.7 | Preferred for body text |
| Black text on #663E4B | 2.35:1 | Fails | Lc 13.7 | Not readable |
| #663E4B text on white | 8.91:1 | AAA | Lc 90.3 | Preferred for body text |
| #663E4B text on black | 2.35:1 | Fails | Lc -12.0 | 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
#F0E7EA
oklch(93.6% 0.011 354.9)
-
Step 200
200
#E5D4D9
oklch(88.5% 0.02 357.7)
-
Step 300
300
#D4B8C0
oklch(80.9% 0.034 358.7)
-
Step 400
400
#BE93A0
oklch(70.7% 0.054 358.6)
-
Step 500
500
#AD7888
oklch(63.1% 0.069 359.6)
-
Step 600
600
#986072
oklch(55.6% 0.076 359.1)
-
Step 700
700
#824F60
oklch(49.1% 0.072 358.6)
-
Step 800
800 (this color)
#663E4B
oklch(41.5% 0.059 359)
-
Step 900
900
#563741
oklch(37.7% 0.047 358.6)
-
Step 950
950
#322126
oklch(27.1% 0.027 359.8)
#663E4B 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) | #43454B | 0.064 |
| Deuteranopia (no green cones) | #4D4C4A | 0.059 |
| Tritanopia (no blue cones) | #6C3C43 | 0.016 |
| Achromatopsia (no color) | #4A4A4A | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663E4B
#663E4B
oklch(41.5% 0.059 359)
- #21564C
#21564C
oklch(41.4% 0.059 178.9)
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 #663E4B, 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 0.034
- Charcoal Grey #3C4142 ΔE 0.078
- Dark Mauve #874C62 ΔE 0.082
- Dusty Grape #545775 ΔE 0.086
- Chestnut #742802 ΔE 0.088
- Mud Brown #60460F ΔE 0.091
- Red Brown #8B2E16 ΔE 0.093
Use #663E4B 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.