#553F85
Closest named color: Dark Slate Blue (#483D8B). oklch(42.6% 0.113 295.7), rgb(85, 63, 133).
Aa
White text reads best on this color (8.62:1).
About this color
#553F85 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.113 and its hue 296°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.026 away. White text reads best on it, at 8.62:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.113) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.43:1 |
| White text | 8.62:1 |
Values
| HEX | #553F85 |
| RGB | rgb(85, 63, 133) |
| HSL | hsl(259, 36%, 38%) |
| OKLCH | oklch(42.6% 0.113 295.7) |
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 #553F85 | 8.62:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #553F85 | 2.43:1 | Fails | Lc 14.6 | Not readable |
| #553F85 text on white | 8.62:1 | AAA | Lc 89.4 | Fine for body text |
| #553F85 text on black | 2.43:1 | Fails | Lc -12.8 | 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
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EBE8F6
oklch(93.7% 0.019 295.9)
-
Step 200
200
#DBD5EF
oklch(88.6% 0.036 296.2)
-
Step 300
300
#C4B9E7
oklch(81% 0.065 295.9)
-
Step 400
400
#A693DB
oklch(70.7% 0.105 295.7)
-
Step 500
500
#9176D1
oklch(63% 0.135 296)
-
Step 600
600
#7C5DBF
oklch(55.6% 0.148 295.8)
-
Step 700
700
#694CA4
oklch(49% 0.137 296.2)
-
Step 800
800 (this color)
#553F85
oklch(42.6% 0.113 295.7)
-
Step 900
900
#46366B
oklch(37.7% 0.089 295.7)
-
Step 950
950
#29203E
oklch(27% 0.055 296.3)
#553F85 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) | #254C87 | 0.071 |
| Deuteranopia (no green cones) | #2A4B83 | 0.067 |
| Tritanopia (no blue cones) | #4A4D5C | 0.090 |
| Achromatopsia (no color) | #4C4C4C | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553F85
#553F85
oklch(42.6% 0.113 295.7)
- #4D5500
#4D5500
oklch(42.8% 0.098 115.9)
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 #553F85, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.026
- Blueberry #464196 ΔE 0.037
- Twilight #4E518B ΔE 0.048
- Rebecca Purple #663399 ΔE 0.052
- Dusk #4E5481 ΔE 0.060
- Cobalt #1E488F ΔE 0.075
- Dusk Blue #26538D ΔE 0.077
- Dusty Grape #545775 ΔE 0.078
Use #553F85 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.