Top 8 Open-Source Alternatives to Pulsar

The top open-source alternatives to Pulsar are Socket.io, NATS, and Pusher. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Socket.io Landing Page
1

Socket.io

Realtime application framework (Node.JS server)
Pricing:
- Open Source
#Developer Tools #App Development #Mobile Push Messaging 717 social mentions
NATS Landing Page
2

NATS

NATS.io is an open source messaging system for cloud native applications, IoT messaging, Edge, and microservices architectures.
Pricing:
- Open Source
#Developer Tools #Queueing, Messaging And Background Processing #App Development 63 social mentions
Pusher Landing Page
3

Pusher

Pusher is a hosted API for quickly, easily and securely adding scalable realtime functionality via WebSockets to web and mobile apps.
Pricing:
- Open Source
#Mobile Push Messaging #Developer Tools #App Development 50 social mentions
emitter.io Landing Page
4

emitter.io

Real-time communication service for connecting online devices.
Pricing:
- Open Source
#Developer Tools #Mobile Push Messaging #App Development
SocketCluster Landing Page
5

SocketCluster

An open, scalable realtime engine for Node.js
Pricing:
- Open Source
#Developer Tools #App Development #Mobile Push Messaging 8 social mentions
Faye Landing Page
6

Faye

Simple pub/sub messaging for the web
Pricing:
- Open Source
#Developer Tools #App Development #Data Integration 2 social mentions
Supabase Landing Page
7

Supabase

An open source Firebase alternative
Pricing:
- Open Source
#Developer Tools #Realtime Backend / API #Backend As A Service 428 social mentions
Flask Landing Page
8

Flask

a microframework for Python based on Werkzeug, Jinja 2 and good intentions.
Pricing:
- Open Source
#Python Web Framework #Web Frameworks #Developer Tools 42 social mentions