Here is a color palette designed for an Excel spreadsheet, featuring 15 distinct colors that work well together while ensuring clear separation:

json
{
  "palette_name": "Excel Vibrant Palette",
  "colors": [
    {
      "name": "Sky Blue",
      "hex_code": "
                            
                            #00A3E0
                        "
    },
    {
      "name": "Sunshine Yellow",
      "hex_code": "
                            
                            #F6EB61
                        "
    },
    {
      "name": "Coral Red",
      "hex_code": "
                            
                            #FF6F61
                        "
    },
    {
      "name": "Lime Green",
      "hex_code": "
                            
                            #A8D300
                        "
    },
    {
      "name": "Lavender Purple",
      "hex_code": "
                            
                            #BFA5E6
                        "
    },
    {
      "name": "Peach Orange",
      "hex_code": "
                            
                            #FF9A3C
                        "
    },
    {
      "name": "Turquoise",
      "hex_code": "
                            
                            #00B2A9
                        "
    },
    {
      "name": "Soft Pink",
      "hex_code": "
                            
                            #F4B3C2
                        "
    },
    {
      "name": "Mint Green",
      "hex_code": "
                            
                            #A8E6CE
                        "
    },
    {
      "name": "Salmon Pink",
      "hex_code": "
                            
                            #FF6F61
                        "
    },
    {
      "name": "Rich Purple",
      "hex_code": "
                            
                            #6A0DAD
                        "
    },
    {
      "name": "Golden Yellow",
      "hex_code": "
                            
                            #FFD700
                        "
    },
    {
      "name": "Steel Blue",
      "hex_code": "
                            
                            #4682B4
                        "
    },
    {
      "name": "Crimson Red",
      "hex_code": "
                            
                            #DC143C
                        "
    },
    {
      "name": "Charcoal Gray",
      "hex_code": "
                            
                            #36454F
                        "
    }
  ]
}

This palette includes a variety of vibrant and neutral colors to ensure all data points stand out clearly against each other.

Would you like any specific adjustments to this palette or additional information on how to use it in your spreadsheet?