no, it's more like you can use the same key with different Nostr clients, and once you log in ( either with public or private key) the client will load your notes.

**I recommend using one place to post and others just to read to minimize the risk of exposing the private key**; e.g. I use the desktop clients with Alby to post, and log in only with the public key to read on other devices. 

Natalia

I see is this some type of cloud sync across devices?

Diego

nostr

Safety Practices on Using Nostr

you can import your nsec into [Alby](https://getalby.com/) or [Nos2x](https://github.com/fiatjaf/nos2x).