#663A42
Closest named color: Purple Brown (#673A3F). oklch(40.5% 0.063 8.5), rgb(102, 58, 66).
Aa
White text reads best on this color (9.33:1).
About this color
#663A42 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.063 and its hue 9°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.005 away. White text reads best on it, at 9.33:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.063) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.24:1 |
| White text | 9.33:1 |
Values
| HEX | #663A42 |
| RGB | rgb(102, 58, 66) |
| HSL | hsl(349, 28%, 31%) |
| OKLCH | oklch(40.5% 0.063 8.5) |
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 #663A42 | 9.33:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #663A42 | 2.24:1 | Fails | Lc 12.6 | Not readable |
| #663A42 text on white | 9.33:1 | AAA | Lc 91.4 | Preferred for body text |
| #663A42 text on black | 2.24:1 | Fails | Lc -11.0 | 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
#F9F4F5
oklch(97.1% 0.006 3.3)
-
Step 100
100
#F1E7E8
oklch(93.6% 0.011 10.3)
-
Step 200
200
#E6D4D6
oklch(88.5% 0.02 9.8)
-
Step 300
300
#D7B7BC
oklch(80.9% 0.037 7.3)
-
Step 400
400
#C29299
oklch(70.8% 0.059 8.9)
-
Step 500
500
#B17680
oklch(63% 0.075 8.3)
-
Step 600
600
#9C5F6A
oklch(55.6% 0.081 8.3)
-
Step 700
700
#864E58
oklch(49.2% 0.076 8.7)
-
Step 800
800 (this color)
#663A42
oklch(40.5% 0.063 8.5)
-
Step 900
900
#58363C
oklch(37.6% 0.049 8.2)
-
Step 950
950
#342023
oklch(27% 0.031 9.5)
#663A42 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) | #414242 | 0.070 |
| Deuteranopia (no green cones) | #4C4A41 | 0.064 |
| Tritanopia (no blue cones) | #6D363D | 0.016 |
| Achromatopsia (no color) | #474747 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663A42
#663A42
oklch(40.5% 0.063 8.5)
- #135450
#135450
oklch(40.6% 0.063 188.9)
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 #663A42, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.005
- Brownish Purple #76424E ΔE 0.042
- Chestnut #742802 ΔE 0.074
- Charcoal Grey #3C4142 ΔE 0.077
- Mud Brown #60460F ΔE 0.084
- Red Brown #8B2E16 ΔE 0.086
- Wine Red #7B0323 ΔE 0.091
- Bordeaux #7B002C ΔE 0.092
Use #663A42 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.