Here’s a high-contrast highlight color palette that complements the hex code #5155c9 , ensuring that each color stands out distinctly against one another.

{
  "palette_name": "High Contrast Palette for 
                            
                            #5155c9
                        ",
  "colors": [
    {
      "name": "Crimson Red",
      "hex_code": "
                            
                            #DC143C
                        "
    },
    {
      "name": "Bright Yellow",
      "hex_code": "
                            
                            #FFFF00
                        "
    },
    {
      "name": "Deep Purple",
      "hex_code": "
                            
                            #4B0082
                        "
    },
    {
      "name": "Neon Green",
      "hex_code": "
                            
                            #39FF14
                        "
    },
    {
      "name": "Vivid Orange",
      "hex_code": "
                            
                            #FF4500
                        "
    }
  ]
}

Palette Description:

This high-contrast palette is designed to create a striking visual impact when used alongside #5155c9 . Crimson red and bright yellow provide a bold clash, while deep purple adds depth and richness. Neon green introduces an electric quality, and vivid orange adds warmth and excitement. Each color is chosen for its ability to stand out and create an engaging contrast.

Would you like to explore applications for this palette or any other variations?