#553579
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.114 303.4), rgb(85, 53, 121).
Aa
White text reads best on this color (9.67:1).
About this color
#553579 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.114 and its hue 303°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.040 away. White text reads best on it, at 9.67:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.114) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.17:1 |
| White text | 9.67:1 |
Values
| HEX | #553579 |
| RGB | rgb(85, 53, 121) |
| HSL | hsl(268, 39%, 34%) |
| OKLCH | oklch(40.1% 0.114 303.4) |
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 #553579 | 9.67:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #553579 | 2.17:1 | Fails | Lc 11.8 | Not readable |
| #553579 text on white | 9.67:1 | AAA | Lc 92.1 | Preferred for body text |
| #553579 text on black | 2.17:1 | Fails | Lc -10.3 | 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
#F7F4FC
oklch(97.2% 0.011 303.1)
-
Step 100
100
#EDE6F8
oklch(93.6% 0.025 303.5)
-
Step 200
200
#DFD2F3
oklch(88.4% 0.047 303.3)
-
Step 300
300
#CCB4EE
oklch(81% 0.084 303.5)
-
Step 400
400
#B28AE6
oklch(70.7% 0.136 303.1)
-
Step 500
500
#A06ADE
oklch(63.2% 0.173 303.3)
-
Step 600
600
#8B4ECC
oklch(55.6% 0.189 303)
-
Step 700
700
#773DB0
oklch(49.1% 0.177 303.7)
-
Step 800
800
#60348F
oklch(42.7% 0.146 303)
-
Step 900
900 (this color)
#553579
oklch(40.1% 0.114 303.4)
-
Step 950
950
#2E1C43
oklch(27% 0.072 303.2)
#553579 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) | #1D447B | 0.086 |
| Deuteranopia (no green cones) | #274477 | 0.078 |
| Tritanopia (no blue cones) | #4E4251 | 0.086 |
| Achromatopsia (no color) | #444444 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553579
#553579
oklch(40.1% 0.114 303.4)
- #3E5000
#3E5000
oklch(40.1% 0.099 123.2)
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 #553579, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.040
- Blueberry #464196 ΔE 0.058
- Rebecca Purple #663399 ΔE 0.061
- Twilight #4E518B ΔE 0.075
- Dusk #4E5481 ΔE 0.083
- Grape Purple #5D1451 ΔE 0.090
- Indigo #4B0082 ΔE 0.090
- Cobalt #1E488F ΔE 0.090
Use #553579 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.