Pusher is described as 'hosted API for quickly, easily and securely adding scalable realtime functionality to web and mobile apps' and is an app in the Development category. There are more than 25 alternatives to Pusher for a variety of platforms, including Linux, Mac, Windows, Online / Web-based and Android. The best alternative is Firebase, which is free. Other great apps like Pusher are Stream (Freemium), GUN (Free, Open Source), Socket.io (Free, Open Source) and Etebase (Free, Open Source).
Scalable & Fast API for building social networks, activity feeds, news feeds and activity streams. Aggregated feeds, ranked feeds, analytics and personalization all help you improve your app's engagement, retention and conversion.
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Stream vs Pusher opinions
Almost everyone thinks Stream is a great alternative to Pusher.
tbarbugli ChatKit just announced they are shutting down, Stream provides a data migration process (https://github.com/GetStream/pusher-chatkit-migration)
Etebase makes it easy to build end-to-end encrypted applications by taking care of the encryption and its related challenges. Think Firebase but encrypted in a way that only your users can access their data.
MongooseIM is aimed at large, complex enterprise level projects, where real-time communication is critical for business success. It provides high availability, ease of deployment, development and reliability in production.
With Stream’s chat react components, SDKs, and UI kits, product teams can unleash chat on web, or as a mobile app, with just a few lines of code. Maximize development bandwidth with Stream’s flexible backend messaging API and front-end components.