Came here to say the same. This absolutely works with 1Password, even if you have multiple accounts for a single site (eg Google, or multiple test accounts for

Came here to say the same. This absolutely works with 1Password, even if you have multiple accounts for a single site (eg Google, or multiple test accounts for a site you run). Split logins are very useful for federated auth, as well as for supporting different kinds of multi-factor auth.