I think the less frowned upon way to charge is to just do it once.
If the Apple store supports this, free trial + one time payment sounds like a good way. Don't optimize for freeloaders, as someone else said.
If the app relies only on iPhone hardware and/or is not a live service, an account/subscription should not be required. Even non-devs might justifiably ask "why do I need a subscription for a camera app".
If the Apple store supports this, free trial + one time payment sounds like a good way. Don't optimize for freeloaders, as someone else said.
If the app relies only on iPhone hardware and/or is not a live service, an account/subscription should not be required. Even non-devs might justifiably ask "why do I need a subscription for a camera app".