Firehose.io vs Simperium: What are the differences?

Firehose.io: Build realtime Ruby web applications. Firehose is both a Rack application and JavaScript library that makes building real-time web applications possible; Simperium: Move data everywhere it's needed, instantly and automatically. Simperium is a new kind of data layer. As your app reads and writes data, Simperium circulates that data everywhere it's needed. You add a Simperium library to your app and initialize it. This library keeps a persistent connection to the Simperium hosted service. The Simperium libraries and service work together to efficiently move data around for your users.

Firehose.io and Simperium belong to "Realtime Backend / API" category of the tech stack.

Some of the features offered by Firehose.io are:

• Firehose embraces RESTful design prinicpals and consequently works great with any library that speaks HTTP
• Integrates with Backbone.js and Ember.js
• Hook it into an ORM, like ActiveRecord

On the other hand, Simperium provides the following key features:

• Data transparently moves across mobile, web, and desktop versions of your app
• Your users can read and write data even when they're offline
• Multiple users can collaborate with the same data at the same time