Tap "Premium" on the app's settings screen to purchase the Pro feature. Once you purchase it, you can enjoy all of the following benefits:
・No more ads
・All BGM, rolling sounds, and decision sounds become available
・Metallic dice colors become available
・Save up to 1000 favorites and view up to 1000 history entries
・Fine-tune the shape and feel of the dice in more detail
・Priority support
You can choose from three purchase options: Monthly, Annual, or Lifetime. Please see the next item for the differences.