#663D31
Closest named color: Purple Brown (#673A3F). oklch(40.6% 0.061 37.1), rgb(102, 61, 49).
Aa
White text reads best on this color (9.22:1).
About this color
#663D31 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.061 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.026 away. White text reads best on it, at 9.22:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.061) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #663D31 |
| RGB | rgb(102, 61, 49) |
| HSL | hsl(14, 35%, 30%) |
| OKLCH | oklch(40.6% 0.061 37.1) |
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 #663D31 | 9.22:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #663D31 | 2.27:1 | Fails | Lc 12.9 | Not readable |
| #663D31 text on white | 9.22:1 | AAA | Lc 91.1 | Preferred for body text |
| #663D31 text on black | 2.27:1 | Fails | Lc -11.2 | 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
#F1E8E5
oklch(93.7% 0.011 39.4)
-
Step 200
200
#E6D5D0
oklch(88.5% 0.02 37)
-
Step 300
300
#D6B9B0
oklch(80.8% 0.036 38)
-
Step 400
400
#C19587
oklch(70.7% 0.057 38.4)
-
Step 500
500
#B17A6A
oklch(63.1% 0.073 36.9)
-
Step 600
600
#9C6251
oklch(55.5% 0.08 37.1)
-
Step 700
700
#855142
oklch(49.1% 0.074 36.9)
-
Step 800
800 (this color)
#663D31
oklch(40.6% 0.061 37.1)
-
Step 900
900
#58382F
oklch(37.6% 0.049 36.4)
-
Step 950
950
#34211C
oklch(27% 0.031 35.3)
#663D31 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) | #474230 | 0.059 |
| Deuteranopia (no green cones) | #514B31 | 0.054 |
| Tritanopia (no blue cones) | #6F373A | 0.030 |
| Achromatopsia (no color) | #474747 | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663D31
#663D31
oklch(40.6% 0.061 37.1)
- #19515F
#19515F
oklch(40.5% 0.061 217.7)
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 #663D31, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.026
- Mud Brown #60460F ΔE 0.055
- Brownish Purple #76424E ΔE 0.055
- Chestnut #742802 ΔE 0.058
- Red Brown #8B2E16 ΔE 0.076
- Charcoal Grey #3C4142 ΔE 0.077
- Milk Chocolate #7F4E1E ΔE 0.078
- Rust Brown #8B3103 ΔE 0.078
Use #663D31 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.