Marvel is a free, web-based tool for creating prototypes for any device: desktop, tablet, mobile and more.
The app works by synchronizing with your Dropbox account which simplifies updates (as local file updates are instantly reflected to the Marvel-powered prototypes).
It accepts both images + PSDs and prototypes can be shared with unique URLs, SMS or QR codes.

The app works by synchronizing with your Dropbox account which simplifies updates (as local file updates are instantly reflected to the Marvel-powered prototypes).
It accepts both images + PSDs and prototypes can be shared with unique URLs, SMS or QR codes.