The basic difference is that the release version of the app (live app) is the one that is uploaded to the app stores. trial version of an app (preview app) has the full functionality (including push) of a live app except for the possibility of in-app purchase (IAP) and whenever the app is started app.

Furthermore, there are differences in the required certificates: 

Test / Preview app

  • Android: no certificates required
  • iOS: no certificates required except for testing of individual push notifications or analytics settings
  • free

Release app

  • Android: certificates required
  • iOS: certificates required

Moreover, the Android and iOS developer accounts have both been linked to the Purple DS Manager account. 

The creation and building of Purple DS is  free for you .