Sketching up the frames of your app is a great way to make it a bit more realistic. This is a step that can’t be avoided when building any kind of application.
But, you can take this to the next level.
Using some of the tools mentioned below, you can create even interactive mockups that can be exported and run on any device working like a real application or a prototype.
This is an efficient way to test your assumptions about your app; it also provides detailed instructions for developers, making their job much easier and faster.