#553779
Closest named color: Dark Slate Blue (#483D8B). oklch(40.4% 0.11 302.8), rgb(85, 55, 121).
Aa
White text reads best on this color (9.50:1).
About this color
#553779 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.110 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 0.039 away. White text reads best on it, at 9.50:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.110) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.20:1 |
| White text | 9.50:1 |
Values
| HEX | #553779 |
| RGB | rgb(85, 55, 121) |
| HSL | hsl(267, 37%, 35%) |
| OKLCH | oklch(40.4% 0.11 302.8) |
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 #553779 | 9.50:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #553779 | 2.20:1 | Fails | Lc 12.2 | Not readable |
| #553779 text on white | 9.50:1 | AAA | Lc 91.8 | Preferred for body text |
| #553779 text on black | 2.20:1 | Fails | Lc -10.6 | 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
#F6F4FA
oklch(97% 0.008 301.4)
-
Step 100
100
#ECE7F4
oklch(93.6% 0.018 303.4)
-
Step 200
200
#DDD4ED
oklch(88.5% 0.035 302)
-
Step 300
300
#C8B7E4
oklch(80.8% 0.065 302.2)
-
Step 400
400
#AD91D6
oklch(70.7% 0.103 302.5)
-
Step 500
500
#9974CB
oklch(63.1% 0.132 302.4)
-
Step 600
600
#845BB7
oklch(55.5% 0.142 302.6)
-
Step 700
700
#704A9E
oklch(49% 0.133 302.7)
-
Step 800
800 (this color)
#553779
oklch(40.4% 0.11 302.8)
-
Step 900
900
#4B3567
oklch(37.8% 0.086 302.8)
-
Step 950
950
#2C1F3C
oklch(27% 0.055 303.6)
#553779 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) | #21457B | 0.081 |
| Deuteranopia (no green cones) | #2A4577 | 0.073 |
| Tritanopia (no blue cones) | #4E4352 | 0.083 |
| Achromatopsia (no color) | #464646 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553779
#553779
oklch(40.4% 0.11 302.8)
- #3F5100
#3F5100
oklch(40.5% 0.099 123.1)
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 #553779, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.039
- Blueberry #464196 ΔE 0.057
- Rebecca Purple #663399 ΔE 0.062
- Twilight #4E518B ΔE 0.071
- Dusk #4E5481 ΔE 0.078
- Cobalt #1E488F ΔE 0.088
- Dusty Grape #545775 ΔE 0.092
- Grape Purple #5D1451 ΔE 0.093
Use #553779 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.