PowerApps at its core is a Platform as a Service. It allows you to create Mobile Apps that run on Android, iOS, Windows (Modern Apps) – and with almost any Internet browser. PowerApps is also a mobile app!
Both Power Apps Plan Trial and Power Apps Developer Plan are free, but are created for different purposes: ... If you're already using Power Apps with Office 365 or Dynamics 365, this is the right plan to test the premium functionalities of Power Apps, which are available with paid Power Apps plans.