Although the browser was launched in private beta on November 8, 2010 for desktop, it is not currently supported on the PC or Mac due to work on the iPad and other mobile releases. Rockmelt is now exclusively for iOS (both iPhone and iPad) and Android with versions for Windows 8, and desktop planned.
Rockmelt was created by Rockmelt, Inc., located in Mountain View, California. The first version of their web browser was released November 8, 2010 and the final version, 2.2.0, was released February 9, 2013.
On August 2, 2013, Rockmelt was acquired by Yahoo!. Rockmelt’s apps and website was shut down after August 31, 2013. Yahoo! plans to integrate Rockmelt’s technology throughout various products.
November 7, 2010 - Rockmelt for PC and Mac launches in private beta
March 11, 2011 - Rockmelt for PC and Mac launches in open beta 
^"What happened to Rockmelt for PC/Mac?". 2012-11-28. Retrieved 2012-12-24. "we’ve fallen behind Chromium (the open source browser upon which Rockmelt is based). This means some of your extensions no longer work, and a few security issues have gone unpatched."