Flutter makes it easy and fast to build beautiful apps for mobile and beyond
So i think this is your option: Put all the free time learning app development. I suggest using https://flutter.dev/
Firebase Quickstart Samples for Android
Well. You can host it yourself. So you wont have any server costs. Apart from electeicity bill. And must be running at all times. Alternatively you can use Firebase https://firebase.google.com/ They have free spark plan that you can use to develop app and depending on how many users and usage you will have, might be free. Hovever If you think about it, Your buisness model must cover server costs. So you must be abe to afford it as users base is growing.
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