Ask HN: Cheaper Heroku alternatives for Rails apps?

I want something like Heroku but that is cheaper. My stack is a Rails app + 1 Postgres instance.

I know render.com and fly.io. Do you have any to recommend between these? Any other suggestions?

Besides pricing, I also want it to be as easy to set up as Heroku (or more).

EDIT: I just discovered there's also DigitalOcean's Apps. Anyone has any experience to share? Maybe it's worth considering since I'm already a paying DO customer.

Thanks!