Honestly, having used InstantDB (one of the providers listed in their post), I think it'd be a pretty nice fit.

I've been writing a budget app for my wife and I and I've made it 100% free with 3rd party hosting:

* InstantDB free tier allows 1 dev. That's the remote sync.

* Netlify for the static hosting

* Free private gitlab ci/cd for running some email notification polling, basically a poor mans hosted cron.