#550F91
Closest named color: Indigo (#4B0082). oklch(37.5% 0.186 301.2), rgb(85, 15, 145).
Aa
White text reads best on this color (11.26:1).
About this color
#550F91 is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.186 and its hue 301°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Indigo (#4B0082), ΔE 0.037 away. White text reads best on it, at 11.26:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.186) |
| Temperature | in between |
| Nearest name | Indigo (#4B0082) |
| Black text | 1.86:1 |
| White text | 11.26:1 |
Values
| HEX | #550F91 |
| RGB | rgb(85, 15, 145) |
| HSL | hsl(272, 81%, 31%) |
| OKLCH | oklch(37.5% 0.186 301.2) |
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 #550F91 | 11.26:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #550F91 | 1.86:1 | Fails | Lc 9.4 | Not readable |
| #550F91 text on white | 11.26:1 | AAA | Lc 94.5 | Preferred for body text |
| #550F91 text on black | 1.86:1 | Fails | Lc -8.1 | 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 900.
-
Step 50
50
#F7F3FF
oklch(97.1% 0.016 301.2)
-
Step 100
100
#EEE5FF
oklch(93.7% 0.036 301.4)
-
Step 200
200
#E0D0FF
oklch(88.6% 0.066 300.6)
-
Step 300
300
#CDAFFF
oklch(80.9% 0.115 301.1)
-
Step 400
400
#B580FF
oklch(70.6% 0.184 301.1)
-
Step 500
500
#A556FF
oklch(63% 0.239 301.2)
-
Step 600
600
#9600FE
oklch(55.5% 0.294 301.2)
-
Step 700
700
#7F00D8
oklch(49.2% 0.261 301.3)
-
Step 800
800
#6800B3
oklch(42.7% 0.226 301.1)
-
Step 900
900 (this color)
#550F91
oklch(37.5% 0.186 301.2)
-
Step 950
950
#320F55
oklch(27% 0.118 301.5)
#550F91 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) | #003A94 | 0.123 |
| Deuteranopia (no green cones) | #003A8F | 0.124 |
| Tritanopia (no blue cones) | #473855 | 0.135 |
| Achromatopsia (no color) | #3B3B3B | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #550F91
#550F91
oklch(37.5% 0.186 301.2)
- #3A4800
#3A4800
oklch(37.6% 0.091 121.4)
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 #550F91, closest first.
No curated palette has a color within ΔE 0.04 of #550F91.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo #4B0082 ΔE 0.037
- Chrysanthemum #560BAD ΔE 0.047
- Imperial Purple #480CA8 ΔE 0.050
- Royal Purple #4B006E ΔE 0.066
- Rebecca Purple #663399 ΔE 0.070
- Indigo Blue #3A18B1 ΔE 0.081
- Dark Slate Blue #483D8B ΔE 0.083
- Grape #7209B7 ΔE 0.083
Use #550F91 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.