How To Deploy Your Rails App to a DigitalOcean Droplet Using Dokku - DEV Community

For reference, you can deploy and run about three simple apps on one $6 droplet, but that's only about half the cost of hosting one app on Heroku with a database and caching. Moreover, unlike a Droplet, the Heroku server will sleep when it's not been accessed for a while. This is not to say that Heroku is overpriced. They do a lot of the work for you and charge more for the convenience.