There are two options for your Mobile App, Branded and Unbranded.
For the Unbranded app, your users would download a common app called Finalweb Mobile. Then they would input your organization’s ID into the app and it would link the app to your organization for ongoing use.
The Branded app is the more desired option, where your organization has it’s own app (with your organization’s title) in the iOS and Android App Stores.
The app functions the same way in either case, but the Branded version is more desirable since the name and icon are customized to your organization. To get your app branded in the store, you must have a valid Apple Developer License. The cost for this is approximately $100 per year, paid to Apple. To enroll, you can start here: Enroll Now (Google does not require a paid developer license).