Shopping cart using variables to calculate selected item amount, and total costs using variables. Project also includes a thumbnail gallery

Designers can use their favorite design tools like Photoshop and Sketch to design the finest details of the user interface for their app. Single or multiple touch interactions can be applied on any UI element (layer) on each screen. Sophisticated animations can be created on-screen as well as screen transitions, using the powerful timeline animation features that Proto.io offers.

This is an expand/collapse menu example that can be created using container states.

Interactive TV app prototype of Hulu's home page. Use the arrow keys on your keyboard (note: mouse click to enable keys) or map to a remote control on a television screen to explore a Hulu like home screen with proto io. Note: Must click the canvas to enable key presses, this seems to be a common restriction with most prototyping tools when building key press focus interaction models.

Used variables to change filters on an image

Test app I made to try this out :)