Pusher vs Radar: What are the differences?
What is Pusher? Hosted APIs to build realtime apps with less code. Pusher is the category leader in delightful APIs for app developers building communication and collaboration features.
What is Radar? High level API and backend for writing web apps that use push messaging. Radar is built on top of engine.io, the next-generation backend for socket.io. It uses Redis for backend storage, though the assumption is that this is only for storing currently active data.
Pusher and Radar can be primarily classified as "Realtime Backend / API" tools.
Some of the features offered by Pusher are:
- Easily build scalable in-app notifications, chat, realtime graphs, geotracking and more in your web & mobile apps with our hosted pub/sub messaging API.
- Send programmable push notifications to iOS and Android devices with delivery and open rate tracking built in.
- Easily add 1-1 and group Chat to your web & mobile apps. Presence, message storage, rich media, notifications, typing indicators and more.
On the other hand, Radar provides the following key features:
- Backend to multiple front-facing servers
Radar is an open source tool with 209 GitHub stars and 35 GitHub forks. Here's a link to Radar's open source repository on GitHub.
What is Pusher?
What is Radar?
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In the original prototype all the communication was handled by a backend server. Each client connected directly to the server using the socket.io library. This quickly proved to be messy and unreliable, especially on the cheap server being used to host it.
Websockets proved to be a little more reliable, but still just as messy and not all browsers support them. That's when the project was switched over to use Pusher. Using Pusher has allowed all but the initial connection code to be off-loaded onto the client. Now instead of communicating through a self-hosted server, clients can communicate pretty much peer-to-peer over Pusher.
Pusher is used to send update notification whenever Lapzbot joins a server.