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App Engine offers you a choice between two Ruby language environments. Both
environments have the same code-centric developer workflow, scale quickly and
efficiently to handle increasing demand, and enable you to use Google's proven
serving technology to build your web, mobile and IoT applications quickly and
with minimal operational overhead. While the two environments have a lot in
common, they differ in a few important ways.
Application can scale to 0 instances when there is no
traffic. Most cost-effective for applications that have significant periods
where they are not serving traffic
You can run an App Engine application in two environments, the
standard environment and the flexible environment. See a summary
of differences between the two environments.
