#663D36
Closest named color: Purple Brown (#673A3F). oklch(40.7% 0.059 30.3), rgb(102, 61, 54).
Aa
White text reads best on this color (9.18:1).
About this color
#663D36 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.059 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.019 away. White text reads best on it, at 9.18:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.059) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.28:1 |
| White text | 9.18:1 |
Values
| HEX | #663D36 |
| RGB | rgb(102, 61, 54) |
| HSL | hsl(9, 31%, 31%) |
| OKLCH | oklch(40.7% 0.059 30.3) |
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 #663D36 | 9.18:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #663D36 | 2.28:1 | Fails | Lc 13.0 | Not readable |
| #663D36 text on white | 9.18:1 | AAA | Lc 91.0 | Preferred for body text |
| #663D36 text on black | 2.28:1 | Fails | Lc -11.3 | 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
#F0E7E6
oklch(93.5% 0.01 25.1)
-
Step 200
200
#E6D5D2
oklch(88.6% 0.019 29.6)
-
Step 300
300
#D6B9B3
oklch(80.9% 0.035 31.6)
-
Step 400
400
#C1948C
oklch(70.7% 0.056 30)
-
Step 500
500
#B07970
oklch(63% 0.071 29.5)
-
Step 600
600
#9B6258
oklch(55.6% 0.076 30.5)
-
Step 700
700
#855148
oklch(49.2% 0.072 30.5)
-
Step 800
800 (this color)
#663D36
oklch(40.7% 0.059 30.3)
-
Step 900
900
#583833
oklch(37.7% 0.047 29.2)
-
Step 950
950
#33211E
oklch(26.9% 0.029 29.6)
#663D36 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) | #464335 | 0.060 |
| Deuteranopia (no green cones) | #504B35 | 0.056 |
| Tritanopia (no blue cones) | #6E373B | 0.025 |
| Achromatopsia (no color) | #484848 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663D36
#663D36
oklch(40.7% 0.059 30.3)
- #19525B
#19525B
oklch(40.6% 0.059 209.9)
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 #663D36, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.019
- Brownish Purple #76424E ΔE 0.050
- Mud Brown #60460F ΔE 0.061
- Chestnut #742802 ΔE 0.062
- Charcoal Grey #3C4142 ΔE 0.076
- Red Brown #8B2E16 ΔE 0.078
- Rust Brown #8B3103 ΔE 0.081
- Milk Chocolate #7F4E1E ΔE 0.081
Use #663D36 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.