#553C8D
Closest named color: Dark Slate Blue (#483D8B). oklch(42.7% 0.129 294.5), rgb(85, 60, 141).
Aa
White text reads best on this color (8.68:1).
About this color
#553C8D is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.129 and its hue 295°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.023 away. White text reads best on it, at 8.68:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.129) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.41:1 |
| White text | 8.68:1 |
Values
| HEX | #553C8D |
| RGB | rgb(85, 60, 141) |
| HSL | hsl(259, 40%, 39%) |
| OKLCH | oklch(42.7% 0.129 294.5) |
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 #553C8D | 8.68:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #553C8D | 2.41:1 | Fails | Lc 14.5 | Not readable |
| #553C8D text on white | 8.68:1 | AAA | Lc 89.5 | Fine for body text |
| #553C8D text on black | 2.41:1 | Fails | Lc -12.7 | 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
#F6F4FC
oklch(97.1% 0.011 297.6)
-
Step 100
100
#EAE7F7
oklch(93.5% 0.022 294.6)
-
Step 200
200
#DAD4F3
oklch(88.4% 0.043 294.4)
-
Step 300
300
#C3B8ED
oklch(81% 0.075 294.2)
-
Step 400
400
#A691E4
oklch(70.8% 0.121 294.8)
-
Step 500
500
#9173DC
oklch(63.1% 0.155 294.7)
-
Step 600
600
#7C59CA
oklch(55.6% 0.169 294.6)
-
Step 700
700
#6948AE
oklch(49% 0.156 294.9)
-
Step 800
800 (this color)
#553C8D
oklch(42.7% 0.129 294.5)
-
Step 900
900
#463471
oklch(37.7% 0.101 294.6)
-
Step 950
950
#291F42
oklch(27% 0.064 294.9)
#553C8D 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) | #144C90 | 0.084 |
| Deuteranopia (no green cones) | #1C4A8B | 0.080 |
| Tritanopia (no blue cones) | #474D5E | 0.103 |
| Achromatopsia (no color) | #4B4B4B | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553C8D
#553C8D
oklch(42.7% 0.129 294.5)
- #4E5400
#4E5400
oklch(42.6% 0.096 114.4)
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 #553C8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.023
- Blueberry #464196 ΔE 0.030
- Rebecca Purple #663399 ΔE 0.041
- Twilight #4E518B ΔE 0.056
- Dusk #4E5481 ΔE 0.071
- Cobalt #1E488F ΔE 0.076
- Dusk Blue #26538D ΔE 0.082
- Denim Blue #3B5B92 ΔE 0.086
Use #553C8D 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.