There are many examples of applications that are free but let you add features with in-app payments. Think of a game that is free to play, but offers additional levels or virtual goods for a certain price (a low one in most cases). It’s very common to see applications that are free at the ‘trial period’ and later gives premium users the option to buy a specific level that match their needs. It’s a good practice to give users your product or service without any barriers (e.g credit card information). If they find it useful, they will pay for it with a smile.
- A designing web app that give the options to buy more projects (or more shapes, tools, features).
- A Customer Relationship Management (CRM) application, that offer certain capabilities for a price.
The basic options to collect and manage your contacts will be free, but if you wish to send emails they will charge you.
- A game that let you advances more quickly if you buy certain improvements. For example a ‘magic’ power that give you the ability to pass a difficult stage (e.g. the mighty eagle in Angry Birds).