Looks like an interesting project! But I feel like you are asking your users to put a lot of confidence in you to take everything you’re saying for granted. I’m not implying bad faith here, but privacy conscious people typically like to see a bit more detail and evidence of security, rather than general claims/statements.

For example, some things I’m wondering about and would like to know before considering giving the app a try:

* how exactly are you handling encryption? How do you avoid leakage of encryption keys/pass phrases through iOS device backups or other cases where your iOS account could be compromised?

* what does “end to end encryption” mean in this case? There is no sharing feature as far as I can tell, so it’s not about e2e encrypted communications. I assume in this case e2e means continuous encryption at all times (on device and remote) except when the user actually uses the app.

* how do you handle metadata? What’s the trade-off between ease of use (quickly finding photos or scrolling through my full photo collection) and encryption/security?

* how credible is a business model of €5/year/user for something that seems to require quite a bit of work to keep secure? Even if there’s no storage/server cost because you use iCloud storage, there’s still a substantial developer cost to have feature parity with similar photo storage apps and keep up with ever-changing App Store requirements and security developments.

Hope this helps to find out what your (potential) users care about and whether you could improve communication/marketing on those points :-)