#553381
Closest named color: Dark Slate Blue (#483D8B). oklch(40.3% 0.127 300.9), rgb(85, 51, 129).
Aa
White text reads best on this color (9.64:1).
About this color
#553381 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.127 and its hue 301°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.035 away. White text reads best on it, at 9.64:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.127) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.17:1 |
| White text | 9.64:1 |
Values
| HEX | #553381 |
| RGB | rgb(85, 51, 129) |
| HSL | hsl(266, 43%, 35%) |
| OKLCH | oklch(40.3% 0.127 300.9) |
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 #553381 | 9.64:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #553381 | 2.17:1 | Fails | Lc 11.9 | Not readable |
| #553381 text on white | 9.64:1 | AAA | Lc 92.0 | Preferred for body text |
| #553381 text on black | 2.17:1 | Fails | Lc -10.4 | 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
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#ECE7F6
oklch(93.6% 0.021 301.1)
-
Step 200
200
#DDD3F1
oklch(88.4% 0.042 300.7)
-
Step 300
300
#C8B6EA
oklch(80.9% 0.075 300.6)
-
Step 400
400
#AD8EDF
oklch(70.6% 0.12 301)
-
Step 500
500
#9A70D6
oklch(63.1% 0.153 301.1)
-
Step 600
600
#8556C3
oklch(55.6% 0.165 301.1)
-
Step 700
700
#7146A9
oklch(49.2% 0.154 300.9)
-
Step 800
800 (this color)
#553381
oklch(40.3% 0.127 300.9)
-
Step 900
900
#4B336D
oklch(37.8% 0.098 300.9)
-
Step 950
950
#2C1E40
oklch(27% 0.063 301.3)
#553381 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) | #0C4484 | 0.097 |
| Deuteranopia (no green cones) | #1C447F | 0.088 |
| Tritanopia (no blue cones) | #4C4355 | 0.096 |
| Achromatopsia (no color) | #454545 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553381
#553381
oklch(40.3% 0.127 300.9)
- #415000
#415000
oklch(40.4% 0.097 121.2)
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 #553381, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.035
- Rebecca Purple #663399 ΔE 0.050
- Blueberry #464196 ΔE 0.051
- Twilight #4E518B ΔE 0.077
- Indigo #4B0082 ΔE 0.082
- Dusk #4E5481 ΔE 0.088
- Cobalt #1E488F ΔE 0.089
- Chrysanthemum #560BAD ΔE 0.090
Use #553381 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.