#553D99
Closest named color: Blueberry (#464196). oklch(43.7% 0.144 291.3), rgb(85, 61, 153).
Aa
White text reads best on this color (8.35:1).
About this color
#553D99 is a dark, vivid purple. In OKLCH its lightness is 44%, its chroma 0.144 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.026 away. White text reads best on it, at 8.35:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | vivid (0.144) |
| Temperature | in between |
| Nearest name | Blueberry (#464196) |
| Black text | 2.51:1 |
| White text | 8.35:1 |
Values
| HEX | #553D99 |
| RGB | rgb(85, 61, 153) |
| HSL | hsl(256, 43%, 42%) |
| OKLCH | oklch(43.7% 0.144 291.3) |
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 #553D99 | 8.35:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #553D99 | 2.51:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #553D99 text on white | 8.35:1 | AAA | Lc 88.5 | Fine for body text |
| #553D99 text on black | 2.51:1 | Fails | Lc -13.7 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E9E7F9
oklch(93.5% 0.024 291)
-
Step 200
200
#D9D4F6
oklch(88.5% 0.047 292.2)
-
Step 300
300
#C0B7F3
oklch(80.8% 0.084 291.3)
-
Step 400
400
#A290ED
oklch(70.7% 0.134 291.5)
-
Step 500
500
#8D71E8
oklch(63.1% 0.173 291.5)
-
Step 600
600
#7856D6
oklch(55.6% 0.188 291.3)
-
Step 700
700
#6546B9
oklch(49.1% 0.173 291.1)
-
Step 800
800 (this color)
#553D99
oklch(43.7% 0.144 291.3)
-
Step 900
900
#443377
oklch(37.7% 0.112 291.7)
-
Step 950
950
#271F46
oklch(27.1% 0.07 290.3)
#553D99 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) | #004F9C | 0.090 |
| Deuteranopia (no green cones) | #034C97 | 0.089 |
| Tritanopia (no blue cones) | #415265 | 0.117 |
| Achromatopsia (no color) | #4E4E4E | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553D99
#553D99
oklch(43.7% 0.144 291.3)
- #545600
#545600
oklch(43.7% 0.096 111.3)
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 #553D99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.026
- Dark Slate Blue #483D8B ΔE 0.032
- Rebecca Purple #663399 ΔE 0.036
- Twilight #4E518B ΔE 0.060
- Blue With A Hint Of Purple #533CC6 ΔE 0.072
- Bluey Purple #6241C7 ΔE 0.077
- Cobalt #1E488F ΔE 0.078
- Dusk #4E5481 ΔE 0.078
Use #553D99 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.