Is a login page as landing page a good design for an app?
Context: I already have a web application and I'm looking to make an app out of it. It's like SettleUp/Tricount/Splitwise, but for photos rather than expenses. Only group owners need to signup (Google or email/pass) to create the group, while invited guests can see and download photos and videos without the need to signup. They only need to signup if they want to upload or create other groups
This works well for a webapp because users can join from a link and see the album directly. So not sure what to do for the app in this case. Also, the only way to see their photos from different devices is with an account.
I see most competitors have a signup page as the main page when you download the app so not sure if I should do the same. Any advice or suggestions?