Ably Alternatives

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

Open Source

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.

Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.

Try for free Open Source freemium

Realtime application framework (Node.JS server)

Open Source

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

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

Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.

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

Unleash limitless possibilities with Truepush and save up to $600 monthly. Free up to 10K Subscribers on all features.

Open Source free

Engage your mobile and desktop web users with intelligent web push notifications.

Realtime messaging service

Open Source

Re-engage website visitors with push notifications

Apache Kafka is an open-source message broker project developed by the Apache Software Foundation written in Scala.

Open Source

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

Brings voice and messaging to your web and mobile applications.

Open Source