This experiment allows you to test different Subheadlines on your webpage.
The subheadline is the second most important element on your website and it should reaffirm why your reader is on the page and act as a primer for the story that the page is going to tell.
The wording in Subheadlines might be a little tricky to "get right". Testing different Subheadlines will allow you get a better idea of how your visitors think and what they respond to (what converts more).
In an experiment where the subheadline was changed to “Sign-up takes less than 60 seconds.” performed 30% better than “Pay as you go. 30-day free trial on all accounts.”
Be sure to relate your Subheadline content to the Heading content.