SafeBox is a password manager that stores its data on the device with no account and no synchronisation. Entries are protected by a master password and encrypted locally, with backups produced in encrypted form.
The absence of synchronisation is the defining decision and it should be evaluated as a trade rather than as a feature. What it removes is substantial, since there is no server holding an encrypted vault, no provider to be breached, no account to be compromised, and no possibility of the data being present anywhere the owner did not put it. What it introduces is equally real, because a device that is lost, destroyed, or replaced takes the vault with it unless a backup was made deliberately and stored somewhere that survives, and a manager holding every credential is the worst possible thing to have exactly one copy of. That makes backup discipline a requirement rather than a recommendation, and the encrypted backup facility is the part of the application to configure first rather than last. The master password carries the same weight, since with no recovery service there is no route back from forgetting it, which is the intended property and is unforgiving.
It suits someone who will maintain backups and finds the absence of a cloud component worth the effort. Anyone likely to skip that discipline is safer with a synchronised manager, where the recovery path exists.
Link: SafeBox on Google Play