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Google Analytics. Its free and works really well. We ran several A/B campaigns with it at my last company and increased our overall landing page(s) performance by about 75-80% on average.

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I didn't see an option for them to host the pages though or did I miss that feature?

They don't do it. And I can't say I recall seeing a service that does so....

Their AB system works by you specifying certain elements by ID, for example, and they change it on the fly using manipulation of the DOM.

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