I prefer use Sinatra to make simple web app rather than Ruby on Rails. And I like using Heroku when I wanna check simply how its going on.
So I made a simplest Sinatra app to deploy the app as soon as possible. You can clone the reporitory and deploy it soon.
I made two versions, one is using database by PostgreSQL, and another is not using one. If you do not have to use database on Heroku, please checkout
If you want to use database, please use master branch and do not forget runnning command below to add PostgreSQL addon for heroku.
And please edit migrate file to change the scheme of the table, or just remake the migration file. After finishing to edit the migration file, please run command below:
Please let you see README file for detailed usage.