Optimizely

Optimizely helps you optimise your experience for visitors across different channels and devices. It provides the flexibility to run A/B testing across web and mobile versions of your website, so you can start to optimise towards the data. Tweaks to your pages are easy from within the Optimizely admin interface, and the data collected shows you on the fly which versions are winning, in terms of posing the path of least resistance to conversion. With the results from your A/B testing, Optimizely can help you incrementally edge towards the optimum experience towards reaching your maximum revenue potential.

http://www.optimizely.com