am i able to make a non game community app
Sure but Unity is a game engine and best suited for games. It’s really not ideal for something that’s mainly UI.
Check out for example Xamarin instead.
You’re able to make just about anything you want. Just be aware that it may not be the easiest or most efficient approach to the job. Unity’s power consumption on mobile devices, for example, is heavier than an event-driven application framework would be.