#663F33
Closest named color: Purple Brown (#673A3F). oklch(41% 0.059 37.9), rgb(102, 63, 51).
Aa
White text reads best on this color (9.03:1).
About this color
#663F33 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.059 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.027 away. White text reads best on it, at 9.03:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.059) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.32:1 |
| White text | 9.03:1 |
Values
| HEX | #663F33 |
| RGB | rgb(102, 63, 51) |
| HSL | hsl(14, 33%, 30%) |
| OKLCH | oklch(41% 0.059 37.9) |
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 #663F33 | 9.03:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #663F33 | 2.32:1 | Fails | Lc 13.4 | Not readable |
| #663F33 text on white | 9.03:1 | AAA | Lc 90.6 | Preferred for body text |
| #663F33 text on black | 2.32:1 | Fails | Lc -11.7 | 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
#F8F4F3
oklch(97% 0.005 34.3)
-
Step 100
100
#F0E8E5
oklch(93.6% 0.01 41.9)
-
Step 200
200
#E5D5D0
oklch(88.5% 0.019 38.1)
-
Step 300
300
#D5BAB1
oklch(81% 0.034 39.3)
-
Step 400
400
#C09588
oklch(70.7% 0.055 37.5)
-
Step 500
500
#AF7B6B
oklch(63.1% 0.07 37.8)
-
Step 600
600
#9A6353
oklch(55.5% 0.076 37)
-
Step 700
700
#835243
oklch(49% 0.07 37.8)
-
Step 800
800 (this color)
#663F33
oklch(41% 0.059 37.9)
-
Step 900
900
#573930
oklch(37.7% 0.046 37.4)
-
Step 950
950
#33221C
oklch(27.1% 0.029 40.3)
#663F33 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) | #494432 | 0.055 |
| Deuteranopia (no green cones) | #524C33 | 0.051 |
| Tritanopia (no blue cones) | #6E393C | 0.029 |
| Achromatopsia (no color) | #494949 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663F33
#663F33
oklch(41% 0.059 37.9)
- #1E5260
#1E5260
oklch(41% 0.059 218.7)
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 #663F33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.027
- Brownish Purple #76424E ΔE 0.053
- Mud Brown #60460F ΔE 0.053
- Chestnut #742802 ΔE 0.062
- Milk Chocolate #7F4E1E ΔE 0.075
- Charcoal Grey #3C4142 ΔE 0.076
- Red Brown #8B2E16 ΔE 0.078
- Rust Brown #8B3103 ΔE 0.079
Use #663F33 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.