Socket.io Alternatives

Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.

Pusher is a hosted API for quickly, easily and securely adding scalable realtime functionality via WebSockets to web and mobile apps.

SignalR is a server-side software system designed for writing scalable Internet applications, notably web servers.

PubNub is a real-time messaging system for web and mobile apps that can handle API for all platforms and push messages to any device anywhere in the world in a fraction of a second without having to worry about proxies, firewalls or mobile drop-offs.

Serious realtime infrastructure

An open, scalable realtime engine for Node.js

Simple pub/sub messaging for the web

NATS Server is an open source messaging system for cloud native applications, IoT messaging, and microservices architectures.

Realtime messaging service

Lightstreamer is a server for delivering real-time messages to browser-based and mobile...

Apache Kafka is publish-subscribe messaging rethought as a distributed commit log.

Customer engagement platform used by 800K+ developers; the fastest and most reliable way to send push notifications.

freemium $9.0 / Monthly (Plus usage-based costs. (Growth Plan). )

Primus, the creator god of the transformers & an abstraction layer for real-time to prevent...