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 Web-based, Mac, Linux, Windows and Self-Hosted apps. The best Pusher alternative is Supabase, which is both free and Open Source. Other great apps like Pusher are PocketBase, TrailBase, Firebase and Socket.io.
MirrorFly is customizable in-app communication SDKs for businesses to integrate chat, voice, video calling and video conferencing features on their existing web and mobile applications.
Lightstreamer is a server for delivering real-time messages to browser-based and mobile applications, using WebSockets and HTTP. Features include dynamic throttling, bandwidth and frequency control, delta delivery, and total control over security and the quality of service.
Rapid.io is a cloud-hosted service that allows app developers to build realtime user interfaces without having to worry about the underlying infrastructure. It works as a non-relational data store accessible from client-side code.
Apphitect IM Solution is a readymade instant messaging solution equipped to develop real-time chat apps that are capable of multiple modes of communication, organization, security and scalability.
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.
Flexible DataSync is a BAAS with a complete client framework. Developers can build real-time applications and communication services and deploy them easily
SendBird is messaging-as-a-service. It provides the client SDK, chat API, and the backend for apps enabling real-time communication among apps’ own users.
Pushpin is a reverse proxy server that makes it easy to implement WebSocket, HTTP streaming, and HTTP long-polling services. The project is unique among realtime push solutions in that it is designed to address the needs of API creators.
Nchan is a scalable, configurable pub/sub server for the modern web, built as a module for the Nginx web server. Dead simple REST API, super flexible configuration.
Hotsock is a fully-private service that powers real-time functionality in your web and mobile apps, installed serverlessly in your own AWS account.
Kuzzle is a high performance open source, on premise and cloud agnostic backend for IoT and modern apps featuring CRUD, real-time notifications, authentication, geofencing, a full featured cluster mode and more.
atmosphere - Realtime Client Server Framework for the JVM, supporting WebSockets and Cross-Browser Fallbacks Support
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ChatKit just announced they are shutting down, Stream provides a data migration process (https://github.com/GetStream/pusher-chatkit-migration)