Do I need two premium accounts to separate work and personal?

What I did:
I bought premium Agenda for work.

What happened:
I liked it so much I want to use it for my personal note-taking too.

What I expected:
Is the premium account status attached to email only or device only? I use Agenda on my Mac, iPad and iPhone - but does that mean I need to buy it again to put it on a separate email address for privacy reasons?

You don’t need to purchase it over and over. Just setup one Agenda Account, and use that to unlock the features on each device. The Agenda Account is not linked to sync at all.