Atmosphere vs Cocoa (OS X): What are the differences?

Developers describe Atmosphere as "Realtime Client Server Framework for the JVM, supporting WebSockets and Cross-Browser Fallbacks Support". The Atmosphere Framework contains client and server side components for building Asynchronous Web Applications. The majority of popular frameworks are either supporting Atmosphere or supported natively by the framework. The Atmosphere Framework supports all major Browsers and Servers. On the other hand, Cocoa (OS X) is detailed as "The Cocoa frameworks consist of libraries, APIs, and runtimes that form the development layer for all of OS X". Much of Cocoa is implemented in Objective-C, an object-oriented language that is compiled to run at incredible speed, yet employs a truly dynamic runtime making it uniquely flexible. Because Objective-C is a superset of C, it is easy to mix C and even C++ into your Cocoa applications.

Atmosphere and Cocoa (OS X) can be categorized as "Frameworks (Full Stack)" tools.

"Cross-Browse" is the primary reason why developers consider Atmosphere over the competitors, whereas "Great community " was stated as the key factor in picking Cocoa (OS X).

Atmosphere is an open source tool with 3.34K GitHub stars and 720 GitHub forks. Here's a link to Atmosphere's open source repository on GitHub.