What are some alternatives?
BluePrint UI design - Blueprint is an UI design application for iPad and iPhone
Hotjar - Hotjar is a new and easy way to truly understand your web and mobile site visitors.
POP (Prototyping on Paper) - POP helps you make interactive prototype with ease. If you can draw, you can design apps.
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Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
UserZoom - Test, measure, and monitor UX with our cost-effective all-in-one platform. UserZoom is a cloud-based solution for online usability testing.