#553573
Closest named color: Dark Slate Blue (#483D8B). oklch(39.7% 0.106 306), rgb(85, 53, 115).
Aa
White text reads best on this color (9.79:1).
About this color
#553573 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.106 and its hue 306°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.048 away. White text reads best on it, at 9.79:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.106) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.14:1 |
| White text | 9.79:1 |
Values
| HEX | #553573 |
| RGB | rgb(85, 53, 115) |
| HSL | hsl(271, 37%, 33%) |
| OKLCH | oklch(39.7% 0.106 306) |
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 #553573 | 9.79:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #553573 | 2.14:1 | Fails | Lc 11.5 | Not readable |
| #553573 text on white | 9.79:1 | AAA | Lc 92.5 | Preferred for body text |
| #553573 text on black | 2.14:1 | Fails | Lc -9.9 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EDE6F6
oklch(93.5% 0.023 305.6)
-
Step 200
200
#E0D2F1
oklch(88.5% 0.045 305.9)
-
Step 300
300
#CDB4EA
oklch(80.9% 0.079 305.7)
-
Step 400
400
#B48BDF
oklch(70.7% 0.127 305.8)
-
Step 500
500
#A26BD6
oklch(63.1% 0.163 306)
-
Step 600
600
#8D50C3
oklch(55.5% 0.176 305.9)
-
Step 700
700
#7840A8
oklch(49% 0.163 306.1)
-
Step 800
800
#623688
oklch(42.8% 0.135 306.3)
-
Step 900
900 (this color)
#553573
oklch(39.7% 0.106 306)
-
Step 950
950
#2F1C40
oklch(27% 0.068 306.8)
#553573 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) | #224375 | 0.082 |
| Deuteranopia (no green cones) | #2C4471 | 0.074 |
| Tritanopia (no blue cones) | #50404E | 0.078 |
| Achromatopsia (no color) | #444444 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553573
#553573
oklch(39.7% 0.106 306)
- #395000
#395000
oklch(39.7% 0.101 126.3)
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 #553573, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.048
- Blueberry #464196 ΔE 0.066
- Rebecca Purple #663399 ΔE 0.070
- Twilight #4E518B ΔE 0.078
- Grape Purple #5D1451 ΔE 0.084
- Dusk #4E5481 ΔE 0.084
- Cobalt #1E488F ΔE 0.094
- Indigo #4B0082 ΔE 0.094
Use #553573 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.