Do I genuinely need an app, or will a website do?
That depends on whether you need something a browser cannot give you. A modern mobile browser handles camera, location and file upload, and a web application spares you stores, review rounds and installation on devices. An app earns its keep on four things: working a full day without a connection, push notifications that arrive even when the app is closed, tasks that continue in the background, and links to peripherals over bluetooth. If your question is not on that list, an app is a more expensive way to do the same thing.