What are some alternatives?
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Glitch - The easiest way to build apps and bots
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
PythonAnywhere - Host, run, and code Python in the cloud: PythonAnywhere
tsuru - Tsuru is an extensible and open source Platform as a Service software.
AWS Elastic Beanstalk - Quickly deploy and manage applications in the AWS cloud.