Here is a color palette based on your request for yellow, red, green, and the color #1D4ED8 . I’ve created a harmonious palette that can work well in an app UI.

json
{
  "palette_name": "Vibrant UI Palette",
  "colors": [
    {
      "name": "Bright Yellow",
      "hex_code": "
          
          #FFEA00
       "
    },
    {
      "name": "Vivid Red",
      "hex_code": "
          
          #FF3D00
       "
    },
    {
      "name": "Fresh Green",
      "hex_code": "
          
          #4CAF50
       "
    },
    {
      "name": "Deep Blue",
      "hex_code": "
          
          #1D4ED8
       "
    },
    {
      "name": "Soft Gray",
      "hex_code": "
          
          #F5F5F5
       "
    }
  ]
}

Palette Description:

This palette features bright and vibrant colors that can create a lively and engaging user interface. The bright yellow, vivid red, and fresh green provide a pop of color that can be used for buttons and highlights. The deep blue ( #1D4ED8 ) serves as a strong base color for headers or footers, while the soft gray adds a neutral balance, perfect for backgrounds or card designs.

Would you like to explore other color combinations or need help with specific UI elements?