#663524
Closest named color: Purple Brown (#673A3F). oklch(38.8% 0.076 39.7), rgb(102, 53, 36).
Aa
White text reads best on this color (10.00:1).
About this color
#663524 is a dark, moderately saturated red. In OKLCH its lightness is 39%, its chroma 0.076 and its hue 40°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.038 away. White text reads best on it, at 10.00:1.
| Hue family | Reds |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.076) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.09:1 |
| White text | 10.00:1 |
Values
| HEX | #663524 |
| RGB | rgb(102, 53, 36) |
| HSL | hsl(15, 48%, 27%) |
| OKLCH | oklch(38.8% 0.076 39.7) |
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 #663524 | 10.00:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #663524 | 2.09:1 | Fails | Lc 11.0 | Not readable |
| #663524 text on white | 10.00:1 | AAA | Lc 92.9 | Preferred for body text |
| #663524 text on black | 2.09:1 | Fails | Lc -9.6 | 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 900.
-
Step 50
50
#FAF4F2
oklch(97.1% 0.007 39.5)
-
Step 100
100
#F4E6E2
oklch(93.5% 0.016 36.5)
-
Step 200
200
#EDD3CA
oklch(88.6% 0.032 40.1)
-
Step 300
300
#E2B5A6
oklch(80.9% 0.057 39.2)
-
Step 400
400
#D28D76
oklch(70.7% 0.091 39.2)
-
Step 500
500
#C46F52
oklch(63.1% 0.116 39.5)
-
Step 600
600
#AF5636
oklch(55.6% 0.125 40)
-
Step 700
700
#964528
oklch(49% 0.117 39.7)
-
Step 800
800
#7A3A23
oklch(42.7% 0.096 40)
-
Step 900
900 (this color)
#663524
oklch(38.8% 0.076 39.7)
-
Step 950
950
#3A1E14
oklch(27.1% 0.047 40.3)
#663524 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) | #423C22 | 0.071 |
| Deuteranopia (no green cones) | #4E4623 | 0.065 |
| Tritanopia (no blue cones) | #702C31 | 0.038 |
| Achromatopsia (no color) | #424242 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663524
#663524
oklch(38.8% 0.076 39.7)
- #004D5E
#004D5E
oklch(38.8% 0.07 219.1)
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 #663524, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.038
- Chestnut #742802 ΔE 0.040
- Mud Brown #60460F ΔE 0.060
- Reddy Brown #6E1005 ΔE 0.068
- Brownish Purple #76424E ΔE 0.072
- Red Brown #8B2E16 ΔE 0.074
- Rust Brown #8B3103 ΔE 0.076
- Blood #770001 ΔE 0.080
Use #663524 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.