PubNub vs Simperium: What are the differences?

PubNub: Build real-time apps quickly and scale them globally. PubNub makes it easy for you to add real-time capabilities to your apps, without worrying about the infrastructure. Build apps that allow your users to engage in real-time across mobile, browser, desktop and server; 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.

PubNub and Simperium can be categorized as "Realtime Backend / API" tools.

Some of the features offered by PubNub are:

• PubNub SDKs support over 50 of the most popular environments, including: iOS, Android, JavaScript, .NET, Java, Ruby, Python, PHP and many more.
• Data Push - Establish and maintain persistent socket connections to any device (mobile, browser, desktop and server) and push data to global audiences in less than ¼ of a second
• Presence - Automatically detect when users enter or leave your app and whether machines are online

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

"Massively scalable & easy to use" is the primary reason why developers consider PubNub over the competitors, whereas "Simple and useful data model" was stated as the key factor in picking Simperium.