Yes, for the most part. For passwords the story is a bit more complex (they're encrypted locally on all platforms, either with your master password (Desktop, pr

Yes, for the most part. For passwords the story is a bit more complex (they're encrypted locally on all platforms, either with your master password (Desktop, probably Android but I don't remember), or a random key stored in the OS storage for iOS), But we don't use the sync key to encrypt local data ever; many users never set up sync, and have no sync key