#553B68
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.079 309.8), rgb(85, 59, 104).
Aa
White text reads best on this color (9.49:1).
About this color
#553B68 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.079 and its hue 310°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.063 away. White text reads best on it, at 9.49:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.079) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.21:1 |
| White text | 9.49:1 |
Values
| HEX | #553B68 |
| RGB | rgb(85, 59, 104) |
| HSL | hsl(275, 28%, 32%) |
| OKLCH | oklch(40.1% 0.079 309.8) |
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 #553B68 | 9.49:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #553B68 | 2.21:1 | Fails | Lc 12.1 | Not readable |
| #553B68 text on white | 9.49:1 | AAA | Lc 91.9 | Preferred for body text |
| #553B68 text on black | 2.21:1 | Fails | Lc -10.5 | 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 900.
-
Step 50
50
#F7F4FA
oklch(97.1% 0.009 308.4)
-
Step 100
100
#EDE7F3
oklch(93.6% 0.017 308.3)
-
Step 200
200
#E0D4EA
oklch(88.6% 0.032 309.9)
-
Step 300
300
#CCB7DE
oklch(81% 0.059 309.3)
-
Step 400
400
#B390CD
oklch(70.7% 0.095 310.2)
-
Step 500
500
#A073C0
oklch(63% 0.122 310.1)
-
Step 600
600
#8B5AAD
oklch(55.6% 0.134 309.9)
-
Step 700
700
#764A94
oklch(49.1% 0.123 310)
-
Step 800
800
#603D78
oklch(42.7% 0.102 310.1)
-
Step 900
900 (this color)
#553B68
oklch(40.1% 0.079 309.8)
-
Step 950
950
#2E1F39
oklch(27% 0.051 309.8)
#553B68 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) | #32446A | 0.059 |
| Deuteranopia (no green cones) | #384667 | 0.055 |
| Tritanopia (no blue cones) | #53424C | 0.058 |
| Achromatopsia (no color) | #464646 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553B68
#553B68
oklch(40.1% 0.079 309.8)
- #3A501F
#3A501F
oklch(40.1% 0.079 129.5)
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 #553B68, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.063
- Dusk #4E5481 ΔE 0.073
- Twilight #4E518B ΔE 0.075
- Purple Brown #673A3F ΔE 0.077
- Dusty Grape #545775 ΔE 0.079
- Dark Grey Blue #29465B ΔE 0.080
- Blueberry #464196 ΔE 0.080
- Brownish Purple #76424E ΔE 0.084
Use #553B68 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.