I am not sure if it will meet your expectations though, it doesn't really provide something much cheaper than 7/month or for an always-on production service. As I see it, the "eco" dyno is mainly a way to more easily save money with transient dynos (used for things other than production services) -- it does meet your concern about hobby dynos not sleeping though!
There's also a new cheaper very limited postgres corresponding to the previous free postgres.
I am not sure if it will meet your expectations though, it doesn't really provide something much cheaper than 7/month or for an always-on production service. As I see it, the "eco" dyno is mainly a way to more easily save money with transient dynos (used for things other than production services) -- it does meet your concern about hobby dynos not sleeping though!
There's also a new cheaper very limited postgres corresponding to the previous free postgres.