are my keys safe?
TLDR and FAQ
Do I need to pay for In-App purchase to zap?
NO!
In App purchase is an optional feature that you do not need to use.
Check out the App yourself and let us know.
https://apps.apple.com/us/app/current-nostr-bitcoin/id1668517032
Discussion
Great question. YES. The keys are only stored on your phone and never leaves the phone. The key storage on the phone is encrypted and only used when you trigger an action on the App. It also uses all Apple encryption features on the App and phone.