#663B45
Closest named color: Purple Brown (#673A3F). oklch(40.8% 0.062 5.2), rgb(102, 59, 69).
Aa
White text reads best on this color (9.22:1).
About this color
#663B45 is a dark, muted red. In OKLCH its lightness is 41%, its chroma 0.062 and its hue 5°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.009 away. White text reads best on it, at 9.22:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | muted (0.062) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #663B45 |
| RGB | rgb(102, 59, 69) |
| HSL | hsl(346, 27%, 32%) |
| OKLCH | oklch(40.8% 0.062 5.2) |
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 #663B45 | 9.22:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #663B45 | 2.27:1 | Fails | Lc 12.9 | Not readable |
| #663B45 text on white | 9.22:1 | AAA | Lc 91.1 | Preferred for body text |
| #663B45 text on black | 2.27:1 | Fails | Lc -11.2 | 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
#F8F4F5
oklch(97.1% 0.004 360)
-
Step 100
100
#F0E7E9
oklch(93.6% 0.01 2)
-
Step 200
200
#E6D4D7
oklch(88.5% 0.02 6)
-
Step 300
300
#D6B7BD
oklch(80.8% 0.036 4.8)
-
Step 400
400
#C1929B
oklch(70.7% 0.058 5.9)
-
Step 500
500
#B07783
oklch(63.1% 0.073 5.6)
-
Step 600
600
#9B5F6D
oklch(55.6% 0.08 4.9)
-
Step 700
700
#854E5B
oklch(49.2% 0.076 5)
-
Step 800
800 (this color)
#663B45
oklch(40.8% 0.062 5.2)
-
Step 900
900
#58373E
oklch(37.8% 0.048 5.8)
-
Step 950
950
#332024
oklch(26.9% 0.03 5.5)
#663B45 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) | #424345 | 0.067 |
| Deuteranopia (no green cones) | #4C4B44 | 0.064 |
| Tritanopia (no blue cones) | #6D383F | 0.016 |
| Achromatopsia (no color) | #474747 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663B45
#663B45
oklch(40.8% 0.062 5.2)
- #17554E
#17554E
oklch(40.9% 0.063 184.3)
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 #663B45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.009
- Brownish Purple #76424E ΔE 0.040
- Charcoal Grey #3C4142 ΔE 0.077
- Chestnut #742802 ΔE 0.078
- Mud Brown #60460F ΔE 0.087
- Red Brown #8B2E16 ΔE 0.089
- Dark Mauve #874C62 ΔE 0.089
- Onyx #343A40 ΔE 0.093
Use #663B45 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.