Password Protector

The App uses device authentication to login and hence it's as secure as your phone is.
Account details can be backed up by exporting to a file and restored from the same file, when needed. These files will be encrypted before exporting.
App stores all data on the phone, the account details will not be shared across the network.
All features of the app are completely free to use, including the export/import and biometrics authentication features.