#553B9D
Closest named color: Blueberry (#464196). oklch(43.7% 0.152 291), rgb(85, 59, 157).
Aa
White text reads best on this color (8.40:1).
About this color
#553B9D is a dark, vivid purple. In OKLCH its lightness is 44%, its chroma 0.152 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.030 away. White text reads best on it, at 8.40:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | vivid (0.152) |
| Temperature | in between |
| Nearest name | Blueberry (#464196) |
| Black text | 2.49:1 |
| White text | 8.40:1 |
Values
| HEX | #553B9D |
| RGB | rgb(85, 59, 157) |
| HSL | hsl(256, 45%, 42%) |
| OKLCH | oklch(43.7% 0.152 291) |
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 #553B9D | 8.40:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #553B9D | 2.49:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #553B9D text on white | 8.40:1 | AAA | Lc 88.6 | Fine for body text |
| #553B9D text on black | 2.49:1 | Fails | Lc -13.6 | 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
#D8D4F8
oklch(88.4% 0.049 290.4)
-
Step 300
300
#C0B7F6
oklch(80.9% 0.088 290.8)
-
Step 400
400
#A28FF2
oklch(70.8% 0.142 291.1)
-
Step 500
500
#8D6FED
oklch(63.1% 0.182 291.2)
-
Step 600
600
#7854DB
oklch(55.6% 0.197 290.9)
-
Step 700
700
#6543BE
oklch(49.1% 0.183 290.8)
-
Step 800
800 (this color)
#553B9D
oklch(43.7% 0.152 291)
-
Step 900
900
#44327A
oklch(37.7% 0.118 291.2)
-
Step 950
950
#271E48
oklch(27% 0.075 290.3)
#553B9D 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) | #004FA0 | 0.091 |
| Deuteranopia (no green cones) | #004B9B | 0.090 |
| Tritanopia (no blue cones) | #3F5266 | 0.124 |
| Achromatopsia (no color) | #4D4D4D | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553B9D
#553B9D
oklch(43.7% 0.152 291)
- #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 #553B9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.030
- Rebecca Purple #663399 ΔE 0.035
- Dark Slate Blue #483D8B ΔE 0.037
- Blue With A Hint Of Purple #533CC6 ΔE 0.066
- Twilight #4E518B ΔE 0.067
- Bluey Purple #6241C7 ΔE 0.072
- Chrysanthemum #560BAD ΔE 0.072
- Blurple #5539CC ΔE 0.075
Use #553B9D 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.