[woven]

More specifically, Dart on App Engine via Managed VMs. (Dart was already runnable on Compute Engine instances.)

App Engine is a subset of Cloud Platform services and is a platform-as-a-service (PaaS) offering – auto scaling, a scalable datastore, logging and other managed services and guarantees that aim to substantially reduce your DevOps.

By contrast, Compute Engine (and its closest competitor AWS) is more an infrastructure-as-a-service (IaaS) offering – provision your instances and run anything you'd like on it, as well as choose from available resources like load balancers and firewalls to meet your needs.

Managed VMs attempt to offer the best of both worlds: the managed scalability of App Engine with the choice and flexibility of Compute Engine. Through a Docker-based container approach, App Engine scalability guarantees are still kept while allowing you to run your own language, like Dart or Node.js, and services.

My Dart app, http://woven.co, has been running on Compute Engine, and I plan to move it to App Engine.