#553371
Closest named color: Dark Slate Blue (#483D8B). oklch(39.2% 0.106 307.5), rgb(85, 51, 113).
Aa
White text reads best on this color (10.00:1).
About this color
#553371 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.106 and its hue 308°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.052 away. White text reads best on it, at 10.00:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.106) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.09:1 |
| White text | 10.00:1 |
Values
| HEX | #553371 |
| RGB | rgb(85, 51, 113) |
| HSL | hsl(273, 38%, 32%) |
| OKLCH | oklch(39.2% 0.106 307.5) |
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 #553371 | 10.00:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #553371 | 2.09:1 | Fails | Lc 11.0 | Not readable |
| #553371 text on white | 10.00:1 | AAA | Lc 93.0 | Preferred for body text |
| #553371 text on black | 2.09:1 | Fails | Lc -9.5 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EEE6F6
oklch(93.6% 0.023 308.2)
-
Step 200
200
#E1D2F0
oklch(88.5% 0.044 307.9)
-
Step 300
300
#CEB3E9
oklch(80.8% 0.08 307.4)
-
Step 400
400
#B68ADE
oklch(70.7% 0.128 307.5)
-
Step 500
500
#A46AD5
oklch(63.1% 0.164 307.4)
-
Step 600
600
#904FC2
oklch(55.7% 0.178 307.7)
-
Step 700
700
#7A3FA7
oklch(49.1% 0.164 307.6)
-
Step 800
800
#633588
oklch(42.7% 0.136 307.1)
-
Step 900
900 (this color)
#553371
oklch(39.2% 0.106 307.5)
-
Step 950
950
#2F1C40
oklch(27% 0.068 306.8)
#553371 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) | #214173 | 0.084 |
| Deuteranopia (no green cones) | #2B436F | 0.077 |
| Tritanopia (no blue cones) | #513E4D | 0.076 |
| Achromatopsia (no color) | #424242 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553371
#553371
oklch(39.2% 0.106 307.5)
- #364F00
#364F00
oklch(39.2% 0.102 127.5)
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 #553371, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.052
- Blueberry #464196 ΔE 0.071
- Rebecca Purple #663399 ΔE 0.073
- Grape Purple #5D1451 ΔE 0.078
- Twilight #4E518B ΔE 0.084
- Dusk #4E5481 ΔE 0.089
- Indigo #4B0082 ΔE 0.091
- Royal Purple #4B006E ΔE 0.091
Use #553371 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.