Popular languages Build your application in Node.js, Java, Ruby, C#, Go, Python, or PHP—or bring your own language runtime.

Open and flexible Custom runtimes allow you to bring any library and framework to App Engine by supplying a Docker container.

Fully managed A fully managed environment lets you focus on code while App Engine manages infrastructure concerns.

Powerful application diagnostics Use Cloud Monitoring and Cloud Logging to monitor the health and performance of your app and Cloud Debugger and Error Reporting to diagnose and fix bugs quickly.

Application versioning Easily host different versions of your app, and easily create development, test, staging, and production environments.

Traffic splitting Route incoming requests to different app versions, A/B test, and do incremental feature rollouts.

Application security Help safeguard your application by defining access rules with App Engine firewall and leverage managed SSL/TLS certificates by default on your custom domain at no additional cost.