#553366
Closest named color: Dark Slate Blue (#483D8B). oklch(38.5% 0.092 313.5), rgb(85, 51, 102).
Aa
White text reads best on this color (10.23:1).
About this color
#553366 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.092 and its hue 314°. 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 10.23:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.092) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.05:1 |
| White text | 10.23:1 |
Values
| HEX | #553366 |
| RGB | rgb(85, 51, 102) |
| HSL | hsl(280, 33%, 30%) |
| OKLCH | oklch(38.5% 0.092 313.5) |
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 #553366 | 10.23:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #553366 | 2.05:1 | Fails | Lc 10.4 | Not readable |
| #553366 text on white | 10.23:1 | AAA | Lc 93.6 | Preferred for body text |
| #553366 text on black | 2.05:1 | Fails | Lc -9.0 | 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 900.
-
Step 50
50
#F8F4FA
oklch(97.2% 0.009 314.8)
-
Step 100
100
#EFE6F4
oklch(93.6% 0.021 313.8)
-
Step 200
200
#E2D2EC
oklch(88.5% 0.039 312.6)
-
Step 300
300
#D1B4E1
oklch(80.9% 0.07 313.5)
-
Step 400
400
#B98CD1
oklch(70.7% 0.109 313.4)
-
Step 500
500
#A86DC5
oklch(63.1% 0.142 313.8)
-
Step 600
600
#9353B2
oklch(55.6% 0.154 313.6)
-
Step 700
700
#7D4399
oklch(49.1% 0.143 313.5)
-
Step 800
800
#66387C
oklch(42.8% 0.118 313.7)
-
Step 900
900 (this color)
#553366
oklch(38.5% 0.092 313.5)
-
Step 950
950
#301D3A
oklch(26.9% 0.058 313.2)
#553366 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) | #283F68 | 0.077 |
| Deuteranopia (no green cones) | #324265 | 0.069 |
| Tritanopia (no blue cones) | #543B47 | 0.064 |
| Achromatopsia (no color) | #414141 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553366
#553366
oklch(38.5% 0.092 313.5)
- #2F4E14
#2F4E14
oklch(38.6% 0.092 133.3)
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 #553366, 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
- Grape Purple #5D1451 ΔE 0.069
- Purple Brown #673A3F ΔE 0.084
- Blueberry #464196 ΔE 0.086
- Rebecca Purple #663399 ΔE 0.090
- Dark Grey Blue #29465B ΔE 0.091
- Rich Purple #720058 ΔE 0.091
- Velvet #750851 ΔE 0.091
Use #553366 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.