The current version of 1Password is pretty much seamless for me across Linux, Mac, and iPhone. It's more seamless than it ever was before, honestly. It works for my technical needs and my parents' non-technical needs alike, and greatly simplifies tech support for the latter. I would sincerely recommend giving it a shot if you haven't already.

> I'm not sure a password database is a 'online bodyguard'.

If that's all 1P is, why not just spin up an SQL db yourself? Because, of course, that's not all 1P is. It's a database, a GUI (for five OSes on two architectures, plus web), extensions to auto-fill (and recognise new passwords, or changed passwords) on a range of ever-changing browsers / websites, a great deal of security hardening for their software and servers, an office full of people that evaluate and consider how to combat emerging threat models, etc. None of this is technically impossible to handle yourself, but that's an extremely inefficient allocation of most people's time.