#553C91
Closest named color: Dark Slate Blue (#483D8B). oklch(42.9% 0.135 293.5), rgb(85, 60, 145).
Aa
White text reads best on this color (8.60:1).
About this color
#553C91 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.135 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.025 away. White text reads best on it, at 8.60:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.135) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.44:1 |
| White text | 8.60:1 |
Values
| HEX | #553C91 |
| RGB | rgb(85, 60, 145) |
| HSL | hsl(258, 41%, 40%) |
| OKLCH | oklch(42.9% 0.135 293.5) |
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 #553C91 | 8.60:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #553C91 | 2.44:1 | Fails | Lc 14.7 | Not readable |
| #553C91 text on white | 8.60:1 | AAA | Lc 89.2 | Fine for body text |
| #553C91 text on black | 2.44:1 | Fails | Lc -13.0 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#EAE7F8
oklch(93.5% 0.023 294.1)
-
Step 200
200
#DAD4F4
oklch(88.5% 0.044 294.1)
-
Step 300
300
#C2B7EF
oklch(80.8% 0.079 293.6)
-
Step 400
400
#A490E7
oklch(70.6% 0.126 293.5)
-
Step 500
500
#9072E0
oklch(63.1% 0.161 293.8)
-
Step 600
600
#7B58CE
oklch(55.6% 0.175 293.6)
-
Step 700
700
#6847B2
oklch(49.1% 0.163 293.8)
-
Step 800
800 (this color)
#553C91
oklch(42.9% 0.135 293.5)
-
Step 900
900
#453473
oklch(37.7% 0.104 293.2)
-
Step 950
950
#281F43
oklch(27% 0.065 293)
#553C91 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) | #0B4D94 | 0.088 |
| Deuteranopia (no green cones) | #154A8F | 0.083 |
| Tritanopia (no blue cones) | #454E60 | 0.108 |
| Achromatopsia (no color) | #4C4C4C | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553C91
#553C91
oklch(42.9% 0.135 293.5)
- #505500
#505500
oklch(43% 0.096 113.6)
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 #553C91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.025
- Blueberry #464196 ΔE 0.028
- Rebecca Purple #663399 ΔE 0.038
- Twilight #4E518B ΔE 0.058
- Dusk #4E5481 ΔE 0.074
- Cobalt #1E488F ΔE 0.077
- Dusk Blue #26538D ΔE 0.083
- Chrysanthemum #560BAD ΔE 0.085
Use #553C91 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.