
Firebase
Socket.io
Apache Kafka
Pusher
SignalR
RabbitMQ
Apache Pulsar
NATS.io is an open source messaging system for cloud native applications, IoT messaging, Edge, and microservices architectures.

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Which is more popular?
Based on our record, NATS seems to be more popular. It has been mentioned 81 times since March 2021.
Website, pricing, platforms and company facts side by side.
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In their own words, as submitted to SaaSHub.


NATS.io is a connective technology for distributed systems and is a perfect fit to connect devices, edge, cloud or hybrid deployments. True multi-tenancy makes NATS ideal for SaaS and self-healing and scaling technology allows for topology changes anytime with zero downtime.
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What each product offers, as listed by its team.


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Overall verdict
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Walkthroughs and reviews on video.
The coolest OSS project you've never heard of: NATS Getting started!
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How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using NATS and Opalstack. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


NATS is designed to be simple and easy to use, with a small footprint and low latency. It is often used in cloud-native environments to connect different components of a distributed system or to enable communication...
One challenge of NATS is that it does not support reliable message queuing out of the box - messages can be lost if a client disconnects before it receives them. This can be mitigated by using NATS Streaming, a data...
NATS is known for its high performance, low latency, and emphasis on simplicity after it was rewritten in Go. Its rewrite in Go makes NATS an ideal choice for demanding and real-time applications and has increased its...
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Recommendations tracked on public social media and blogs since March 2021.


Under the hood, when you want to run more than one lhttp server (because one server is never enough once your chat app takes off, right?), all the servers talk to each other through NATS, specifically an ancient bundled copy of gnatsd. - Source: dev.to / 2 months ago
NATS and the Synadia Platform are purpose-built for exactly this architecture: leaf node topologies that treat edge clusters as first-class entities, JetStream for local durability and controlled forwarding, decentralized security for... - Source: dev.to / 6 months ago
Https://nats.io Not a drop in replacement, but worth looking at. - Source: Hacker News / 9 months ago
Tracking Opalstack since Sep 2023.
When comparing NATS and Opalstack, you can also consider the following products.

Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Compare Firebase to NATS or Opalstack:


Apache Kafka is an open-source message broker project developed by the Apache Software Foundation written in Scala.
Compare Apache Kafka to NATS or Opalstack:

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

SignalR is a server-side software system designed for writing scalable Internet applications, notably web servers.
Compare SignalR to NATS or Opalstack:
