#663F41
Closest named color: Purple Brown (#673A3F). oklch(41.4% 0.055 16.4), rgb(102, 63, 65).
Aa
White text reads best on this color (8.92:1).
About this color
#663F41 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.055 and its hue 16°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.013 away. White text reads best on it, at 8.92:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.055) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.35:1 |
| White text | 8.92:1 |
Values
| HEX | #663F41 |
| RGB | rgb(102, 63, 65) |
| HSL | hsl(357, 24%, 32%) |
| OKLCH | oklch(41.4% 0.055 16.4) |
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 #663F41 | 8.92:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #663F41 | 2.35:1 | Fails | Lc 13.6 | Not readable |
| #663F41 text on white | 8.92:1 | AAA | Lc 90.3 | Preferred for body text |
| #663F41 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
#F8F4F4
oklch(97% 0.004 17.2)
-
Step 100
100
#F0E7E8
oklch(93.5% 0.01 9.5)
-
Step 200
200
#E5D5D5
oklch(88.6% 0.018 17.5)
-
Step 300
300
#D5B9B9
oklch(81% 0.032 17.8)
-
Step 400
400
#BF9495
oklch(70.7% 0.052 16.9)
-
Step 500
500
#AE797C
oklch(63.1% 0.067 15.4)
-
Step 600
600
#996265
oklch(55.7% 0.072 16.1)
-
Step 700
700
#825154
oklch(49.1% 0.066 15.8)
-
Step 800
800 (this color)
#663F41
oklch(41.4% 0.055 16.4)
-
Step 900
900
#56383A
oklch(37.6% 0.043 14.9)
-
Step 950
950
#332122
oklch(27.1% 0.028 15.4)
#663F41 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) | #464541 | 0.059 |
| Deuteranopia (no green cones) | #504C40 | 0.053 |
| Tritanopia (no blue cones) | #6D3B40 | 0.016 |
| Achromatopsia (no color) | #4A4A4A | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663F41
#663F41
oklch(41.4% 0.055 16.4)
- #215555
#215555
oklch(41.5% 0.055 195.2)
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 #663F41, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.013
- Brownish Purple #76424E ΔE 0.038
- Mud Brown #60460F ΔE 0.073
- Charcoal Grey #3C4142 ΔE 0.075
- Chestnut #742802 ΔE 0.075
- Red Brown #8B2E16 ΔE 0.085
- Milk Chocolate #7F4E1E ΔE 0.086
- Dark Mauve #874C62 ΔE 0.087
Use #663F41 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.