You might consider 1Password. They don’t have the key so they effectively only see an all of the data in encrypted form, not even revealing the site, if I recall.
They have some fascinating papers about it, if I recall.
They have some fascinating papers about it, if I recall.
What has happened to some password managers though is that they don't store the metadata encrypted (like username, website name, etc.) so that leaks have revealed which sites you use but I don't think any decent password manager has leaked passwords without a client being hacked, right?