Keynote isn’t just a presentation tool, it’s also a great prototyping tool. You can layout UI screens as slides, link them together to make them interactive, create animations, and export and test them on mobile devices. With Keynotopia UI kits, you can make great looking prototypes in a couple of hours.
Alternatively, you can use PowerPoint (with this PowerPoint prototyping bundle) if you’re on a Windows PC.
Keynotopia is the largest collection of UI design kits for creating mockups, wireframes, and interactive app prototypes in 30 minutes or less, using Apple Keynote or Microsoft PowerPoint.