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

An example of a date picker that can be imported and used in your project. (Basic use of variables) tags: calendar, picker, date picker

A project which simulates a collision between 2 objects. Freely drag the objects onto each other in order to have their core color change when colliding.

A halloween project i have put together using the Proto.io Halloween icon set: https://proto.io/freebies/free-halloween-icons/

A project which uses Vector Animations to recreate popular social app interactions.

Group project for human-computer interaction

Design Credits: https://www.sketchappsources.com/free-source/2513-simple-book-app-design-sketch-freebie-resource.html