Board of Innovation was one of the first to develop a variety of paper templates to make early prototyping, especially of digital components, easier and more efficient.
Paper, pencil and scissors are still the best tools when it comes to developing early prototypes of apps or other services in design thinking, for example, and then testing them directly on users.
A variety of templates are offered for free download, including prototyping screens of the current iPhone series. In addition, there is a myriad of GUI elements in other files to quickly design the app screens.