Fanout vs Google Cloud Pub/Sub: What are the differences?
Developers describe Fanout as "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. On the other hand, Google Cloud Pub/Sub is detailed as "Global service for real-time and reliable messaging and streaming data". Cloud Pub/Sub is a fully-managed real-time messaging service that allows you to send and receive messages between independent applications. You can leverage Cloud Pub/Sub’s flexibility to decouple systems and components hosted on Google Cloud Platform or elsewhere on the Internet.
Fanout and Google Cloud Pub/Sub belong to "Realtime Backend / API" category of the tech stack.