#553E66
Closest named color: Dark Slate Blue (#483D8B). oklch(40.6% 0.071 309.9), rgb(85, 62, 102).
Aa
White text reads best on this color (9.26:1).
About this color
#553E66 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.071 and its hue 310°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.067 away. White text reads best on it, at 9.26:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.071) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.26:1 |
| White text | 9.26:1 |
Values
| HEX | #553E66 |
| RGB | rgb(85, 62, 102) |
| HSL | hsl(275, 24%, 32%) |
| OKLCH | oklch(40.6% 0.071 309.9) |
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 #553E66 | 9.26:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #553E66 | 2.26:1 | Fails | Lc 12.7 | Not readable |
| #553E66 text on white | 9.26:1 | AAA | Lc 91.3 | Preferred for body text |
| #553E66 text on black | 2.26:1 | Fails | Lc -11.1 | 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
#F6F4F8
oklch(97% 0.006 308.4)
-
Step 100
100
#ECE8F0
oklch(93.6% 0.011 308.3)
-
Step 200
200
#DED5E5
oklch(88.5% 0.024 310.7)
-
Step 300
300
#C9BAD5
oklch(81% 0.041 310.2)
-
Step 400
400
#AD96C0
oklch(70.8% 0.065 309.5)
-
Step 500
500
#997BB0
oklch(63.1% 0.085 309.9)
-
Step 600
600
#84649C
oklch(55.7% 0.092 309.8)
-
Step 700
700
#705285
oklch(49.1% 0.086 310.5)
-
Step 800
800 (this color)
#553E66
oklch(40.6% 0.071 309.9)
-
Step 900
900
#4B3958
oklch(37.7% 0.056 310.4)
-
Step 950
950
#2C2233
oklch(27.1% 0.034 310.9)
#553E66 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) | #364668 | 0.053 |
| Deuteranopia (no green cones) | #3C4865 | 0.048 |
| Tritanopia (no blue cones) | #53444D | 0.051 |
| Achromatopsia (no color) | #474747 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553E66
#553E66
oklch(40.6% 0.071 309.9)
- #3D5126
#3D5126
oklch(40.7% 0.071 129.6)
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 #553E66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.067
- Dusk #4E5481 ΔE 0.068
- Dusty Grape #545775 ΔE 0.071
- Purple Brown #673A3F ΔE 0.071
- Twilight #4E518B ΔE 0.072
- Dark Grey Blue #29465B ΔE 0.075
- Brownish Purple #76424E ΔE 0.078
- Charcoal Grey #3C4142 ΔE 0.080
Use #553E66 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.