Use a variable to add the costs of premium features that are selected or deselected using an iOS switch component. See a video of how to do this step-by-step in this webinar: https://support.proto.io/hc/en-us/articles/115001585411-Model-advanced-prototypes-that-use-variables-part-II TAGS: variables variable math addition switch switches fire an items event

A website template with multilevel dropdown menus and scrolling area.

This Splash screen prototype shows a vector animation of a headphone made in After Effects. Use the Bodymovin plugin that exports a JSON file and can be dropped right into Proto.io.

Change of the header according to scroll position of content.

The Flipboard animation created using states.

A very basic Calendar example project using Containers a few states and 1 variable to track the year.