Google Cloud Messaging vs Notifiers: What are the differences?

Google Cloud Messaging: Simple and reliable messaging to reach over a billion devices. Google Cloud Messaging (GCM) is a free service that enables developers to send messages between servers and client apps. This includes downstream messages from servers to client apps, and upstream messages from client apps to servers; Notifiers: An easy way to send notifications. A one stop shop for all notification providers with a unified and simple interface.

Google Cloud Messaging and Notifiers belong to "Mobile Push Messaging" category of the tech stack.

Some of the features offered by Google Cloud Messaging are:

• Versatile Messaging Targets: Distribute messages to your client app in any of three ways — to single devices, to groups of devices, or to devices subscribed to topics.
• Downstream Messaging: For purposes such as alerting users, chat messaging or kicking off background processing before the user opens the client app, GCM provides a reliable and battery-efficient connection between your server and devices.
• Upstream Messaging: Send acknowledgments, chats, and other messages from devices back to your server over GCM’s reliable and battery-efficient connection channel.

On the other hand, Notifiers provides the following key features:

• Spend your precious time on your own code base, instead of chasing down 3rd party provider APIs
• A minimal set of well known and stable dependencies (requests, jsonschema and click)
• A unified interface means that you already support any new providers that will be added, no more work needed!

Notifiers is an open source tool with 1.17K GitHub stars and 38 GitHub forks. Here's a link to Notifiers's open source repository on GitHub.