There is more than passwords. As a webmaster or developer you manage servers configurations, online services preferences, control panels credentials, ftp users, domains registry, email servers settings and accounts, CMS roles and social networks identities for your clients.
Most of the times such data have been created by you on their behalf. So security and confidentiality are a must for you.
[ admin-admin ] is a desktop application (Mac & Windows) to store all relevant data for your clients projects. Everything is stored right in your local environment as a secure and structured repository. No cloud involved.