In most of the mobile and tablet application that we use every day we can see the application notifications and news services which helps the developers and data providers to be more engaged with their users and make it much more pleasing experience while using the application. These notifications can be categorized to few types base on the way they are working.

The first type and most expensive type is push notifications which usually hosted on a cloud service and pushed to user mobile device by special event which triggers on specific time or happening. These notifications mostly pushed from a web or cloud service to the mobile device and it would increase the cost as the number of the users grow.

The second type of notifications are less flexible as the it only triggers when the users open the application and it makes a request to the server or web service to retrieve the unread messages. This method also requires a database and web service to transfer the messages to the application. With using this method the developer also can keep track of the users and the notifications.

The last type is the most easiest and cheapest among other types of notifications. This method is very similar to the second type of the notifications and basically it’s a simple news or message delivery where it trigger by lunching the application and retrieve all the existing messages and display it to the user.