#553D80
Closest named color: Dark Slate Blue (#483D8B). oklch(41.9% 0.109 298.1), rgb(85, 61, 128).
Aa
White text reads best on this color (8.87:1).
About this color
#553D80 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.109 and its hue 298°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.029 away. White text reads best on it, at 8.87:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.109) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.36:1 |
| White text | 8.87:1 |
Values
| HEX | #553D80 |
| RGB | rgb(85, 61, 128) |
| HSL | hsl(261, 35%, 37%) |
| OKLCH | oklch(41.9% 0.109 298.1) |
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 #553D80 | 8.87:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #553D80 | 2.36:1 | Fails | Lc 13.8 | Not readable |
| #553D80 text on white | 8.87:1 | AAA | Lc 90.1 | Preferred for body text |
| #553D80 text on black | 2.36:1 | Fails | Lc -12.1 | 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
#EBE7F5
oklch(93.5% 0.019 299.1)
-
Step 200
200
#DCD5EE
oklch(88.6% 0.035 298.5)
-
Step 300
300
#C5B8E5
oklch(80.8% 0.064 298.2)
-
Step 400
400
#A893D8
oklch(70.8% 0.101 297.7)
-
Step 500
500
#9476CE
oklch(63.1% 0.132 298.3)
-
Step 600
600
#7F5DBB
oklch(55.6% 0.143 298.3)
-
Step 700
700
#6B4CA1
oklch(49% 0.133 298.2)
-
Step 800
800 (this color)
#553D80
oklch(41.9% 0.109 298.1)
-
Step 900
900
#473669
oklch(37.6% 0.086 297.5)
-
Step 950
950
#2A203D
oklch(27% 0.054 298.6)
#553D80 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) | #254A82 | 0.073 |
| Deuteranopia (no green cones) | #2B497E | 0.067 |
| Tritanopia (no blue cones) | #4C4A58 | 0.087 |
| Achromatopsia (no color) | #4A4A4A | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553D80
#553D80
oklch(41.9% 0.109 298.1)
- #495300
#495300
oklch(41.9% 0.097 117.4)
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 #553D80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.029
- Blueberry #464196 ΔE 0.044
- Twilight #4E518B ΔE 0.054
- Rebecca Purple #663399 ΔE 0.056
- Dusk #4E5481 ΔE 0.063
- Cobalt #1E488F ΔE 0.078
- Dusty Grape #545775 ΔE 0.080
- Dusk Blue #26538D ΔE 0.081
Use #553D80 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.