I'm building a pretty simple app for people to keep track of their budgets and finances. I don't necessarily think a private beta is necessary, but I think that little bit of exclusivity might bring more signups and generate more interest than just a standard launch. Thoughts?

What's the preferred free tier of the cloud services right now? More context: I need to run a basic web UI + API server (which could go to sleep if there's no traffic, but hopefully not!), a Postgres instance, and a constant background daemon.

If there's some criteria you guys use to evaluate an idea, please share!