Refineio
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Wireframes can be useful, but it’s difficult to imagine what the experience of using an app will be from a wireframe alone.

With refine.io you build interactive, functional prototypes in about the same time as a wireframe. Publish your prototypes and test them in any smartphone browser before you invest in development.

Forget lorem ipsum; with real data people testing your prototype can get a real sense of the experience and give you better feedback.

refine.io makes the process of adding data easy by allowing you quickly create data sources or import CSV and XLS files. refine.io also supports remote XML and RSS feeds.

We make it easy to share prototypes and collect feedback; you can email or SMS a link to anyone you’d like. You can also set a password to restrict access to your prototype.

You can also collaborate on prototypes; invite anyone you like to work on a prototype with you and control access to each project individually.