AltoPass Generated passwords
This method doesn't involve storing your password in the cloud or inside an encrypted vault. AltoPass Generated passwords are calculated right on your device. This calculation is deterministic, meaning that it produces the same result every time. There is no reason to keep your passwords in the cloud since we can always calculate them on your device in milliseconds.
AltoPass keeps some of your metadata in the cloud. For instance, we keep your usernames, service identifiers, custom fields, and random seeds (additional parameters of the password calculation on the device) for each account. However, the passwords themselves never travel from your device to our cloud. All these metadata parameters stored in the cloud are not enough for hackers to get access to your account.