#663D40
Closest named color: Purple Brown (#673A3F). oklch(41% 0.058 15.2), rgb(102, 61, 64).
Aa
White text reads best on this color (9.10:1).
About this color
#663D40 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.058 and its hue 15°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.008 away. White text reads best on it, at 9.10:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.058) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.30:1 |
| White text | 9.10:1 |
Values
| HEX | #663D40 |
| RGB | rgb(102, 61, 64) |
| HSL | hsl(356, 25%, 32%) |
| OKLCH | oklch(41% 0.058 15.2) |
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 #663D40 | 9.10:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #663D40 | 2.30:1 | Fails | Lc 13.2 | Not readable |
| #663D40 text on white | 9.10:1 | AAA | Lc 90.8 | Preferred for body text |
| #663D40 text on black | 2.30:1 | Fails | Lc -11.5 | 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
#F8F4F4
oklch(97% 0.004 17.2)
-
Step 100
100
#F0E7E8
oklch(93.5% 0.01 9.5)
-
Step 200
200
#E5D4D5
oklch(88.4% 0.019 13.4)
-
Step 300
300
#D6B8B9
oklch(80.9% 0.035 15.6)
-
Step 400
400
#C09396
oklch(70.6% 0.054 14.1)
-
Step 500
500
#AF787C
oklch(63% 0.069 14.4)
-
Step 600
600
#9A6165
oklch(55.6% 0.074 15.2)
-
Step 700
700
#845054
oklch(49.2% 0.07 15)
-
Step 800
800 (this color)
#663D40
oklch(41% 0.058 15.2)
-
Step 900
900
#57383A
oklch(37.8% 0.044 15.2)
-
Step 950
950
#332122
oklch(27.1% 0.028 15.4)
#663D40 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) | #454440 | 0.062 |
| Deuteranopia (no green cones) | #4F4B3F | 0.057 |
| Tritanopia (no blue cones) | #6D393E | 0.016 |
| Achromatopsia (no color) | #484848 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663D40
#663D40
oklch(41% 0.058 15.2)
- #1B5454
#1B5454
oklch(41% 0.058 195.1)
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 #663D40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.008
- Brownish Purple #76424E ΔE 0.040
- Chestnut #742802 ΔE 0.073
- Charcoal Grey #3C4142 ΔE 0.075
- Mud Brown #60460F ΔE 0.075
- Red Brown #8B2E16 ΔE 0.084
- Rust Brown #8B3103 ΔE 0.089
- Milk Chocolate #7F4E1E ΔE 0.090
Use #663D40 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.