#553B9B
Closest named color: Blueberry (#464196). oklch(43.5% 0.149 291.4), rgb(85, 59, 155).
Aa
White text reads best on this color (8.45:1).
About this color
#553B9B is a dark, vivid purple. In OKLCH its lightness is 44%, its chroma 0.149 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.029 away. White text reads best on it, at 8.45:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | vivid (0.149) |
| Temperature | in between |
| Nearest name | Blueberry (#464196) |
| Black text | 2.48:1 |
| White text | 8.45:1 |
Values
| HEX | #553B9B |
| RGB | rgb(85, 59, 155) |
| HSL | hsl(256, 45%, 42%) |
| OKLCH | oklch(43.5% 0.149 291.4) |
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 #553B9B | 8.45:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #553B9B | 2.48:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #553B9B text on white | 8.45:1 | AAA | Lc 88.7 | Fine for body text |
| #553B9B text on black | 2.48:1 | Fails | Lc -13.5 | 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
#E9E7FA
oklch(93.5% 0.026 290.7)
-
Step 200
200
#D9D4F7
oklch(88.5% 0.048 291.9)
-
Step 300
300
#C1B7F5
oklch(80.9% 0.087 291.7)
-
Step 400
400
#A28FF0
oklch(70.7% 0.14 291.4)
-
Step 500
500
#8D70EB
oklch(63.1% 0.178 291.3)
-
Step 600
600
#7954D9
oklch(55.6% 0.194 291.6)
-
Step 700
700
#6644BC
oklch(49.2% 0.179 291.4)
-
Step 800
800 (this color)
#553B9B
oklch(43.5% 0.149 291.4)
-
Step 900
900
#443279
oklch(37.7% 0.116 291.5)
-
Step 950
950
#281E47
oklch(27% 0.074 292)
#553B9B 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) | #004F9E | 0.091 |
| Deuteranopia (no green cones) | #004B99 | 0.091 |
| Tritanopia (no blue cones) | #415165 | 0.121 |
| Achromatopsia (no color) | #4D4D4D | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553B9B
#553B9B
oklch(43.5% 0.149 291.4)
- #535600
#535600
oklch(43.6% 0.097 112.1)
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 #553B9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.029
- Rebecca Purple #663399 ΔE 0.034
- Dark Slate Blue #483D8B ΔE 0.035
- Twilight #4E518B ΔE 0.065
- Blue With A Hint Of Purple #533CC6 ΔE 0.069
- Chrysanthemum #560BAD ΔE 0.074
- Bluey Purple #6241C7 ΔE 0.075
- Blurple #5539CC ΔE 0.078
Use #553B9B 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.