The cost for developing an app can vary, depending on the type of app, the functionality, and if development is handled internally or through external resources. Estimates for app development can be as little as $50,000 or as much as $250,000.
For most organizations whose core competencies are not in app development, outsourcing the work to an onshore or offshore resource might be the best option, as there is greater access to a wider range of expertise that can deliver the type of app you really want.