Fanout vs WCF: What are the differences?
Fanout: Realtime APIs made simple. Fanout makes it easy to build realtime APIs and apps. The product is a cross between a reverse proxy and a message broker. Receivers subscribe to channels, and published data is delivered in realtime; WCF: A runtime and a set of APIs for building connected, service-oriented applications. It is a framework for building service-oriented applications. Using this, you can send data as asynchronous messages from one service endpoint to another. A service endpoint can be part of a continuously available service hosted by IIS, or it can be a service hosted in an application.
Fanout and WCF can be primarily classified as "Realtime Backend / API" tools.