#553D73
Closest named color: Dark Slate Blue (#483D8B). oklch(41.1% 0.091 303.1), rgb(85, 61, 115).
Aa
White text reads best on this color (9.12:1).
About this color
#553D73 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.091 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 0.046 away. White text reads best on it, at 9.12:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.091) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.30:1 |
| White text | 9.12:1 |
Values
| HEX | #553D73 |
| RGB | rgb(85, 61, 115) |
| HSL | hsl(267, 31%, 35%) |
| OKLCH | oklch(41.1% 0.091 303.1) |
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 #553D73 | 9.12:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #553D73 | 2.30:1 | Fails | Lc 13.1 | Not readable |
| #553D73 text on white | 9.12:1 | AAA | Lc 90.9 | Preferred for body text |
| #553D73 text on black | 2.30:1 | Fails | Lc -11.5 | 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
#F6F4F9
oklch(97% 0.007 304.2)
-
Step 100
100
#ECE8F3
oklch(93.7% 0.015 302.5)
-
Step 200
200
#DDD5EA
oklch(88.6% 0.03 303)
-
Step 300
300
#C7B9DE
oklch(80.9% 0.054 302.4)
-
Step 400
400
#AB94CD
oklch(70.7% 0.085 302.8)
-
Step 500
500
#9778C0
oklch(63% 0.11 303.2)
-
Step 600
600
#8260AC
oklch(55.6% 0.119 303.4)
-
Step 700
700
#6E4F94
oklch(49.1% 0.111 303.3)
-
Step 800
800 (this color)
#553D73
oklch(41.1% 0.091 303.1)
-
Step 900
900
#493860
oklch(37.7% 0.069 302.8)
-
Step 950
950
#2B2138
oklch(27% 0.044 303.6)
#553D73 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) | #2E4875 | 0.064 |
| Deuteranopia (no green cones) | #344872 | 0.058 |
| Tritanopia (no blue cones) | #504652 | 0.069 |
| Achromatopsia (no color) | #484848 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553D73
#553D73
oklch(41.1% 0.091 303.1)
- #415210
#415210
oklch(41% 0.091 123.3)
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 #553D73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.046
- Twilight #4E518B ΔE 0.061
- Blueberry #464196 ΔE 0.063
- Dusk #4E5481 ΔE 0.064
- Dusty Grape #545775 ΔE 0.074
- Rebecca Purple #663399 ΔE 0.075
- YInMn Blue #415A77 ΔE 0.085
- Dark Grey Blue #29465B ΔE 0.086
Use #553D73 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.