What are some alternatives?
When comparing Google Cloud Functions and Google App Engine, you can also consider the following products
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Heroku - Agile deployment platform for Ruby, Node.js, Clojure, Java, Python, and Scala. Setup takes only minutes and deploys are instant through git. Leave tedious server maintenance to Heroku and focus on your code.
Azure Web Apps - Create and deploy mission critical Web apps that scale with your business
OpenShift - OpenShift gives you all the tools you need to develop, host and scale your apps in the public or private cloud. Get started today.
AWS Lambda - Lambda is a cloud service that Amazon Web Services (AWS) provides, which allows developers to run serverless code.
Microsoft Azure - Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.