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.

B2B SaaS: Make your app enterprise-ready! Authentication - SAML/OIDC SSO, Directory Sync (SCIM 2.0), Audit Logs, Data Privacy Vault, and more!

Try for free Open Source free $49.0 / Monthly (Per connection)

Realtime application framework (Node.JS server)

Open Source

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

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

Open Source free

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). )

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

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

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...

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