Recs.
Updated
A rapid prototyping tool to make prototypes on mobile, desktop as well as website, supporting visualized interaction and low learning curve for designers of any level. Fully compatible with both Windows & Mac OS.
Free version for students, teachers, and educators.
SpecsUpdate
Pros
Pro Multiple preview functions are convenient
Mockplus has very comprehensive ways of previewing a prototype. There are basic functions of exporting into picture in two formats. Mockplus also has two ways for preview on cellphone app: scanning QR code and entering view code after uploading project to cloud. QR code scanning for preview is really rare in this kind of software. You don’t need to connect to the computer, or upload the project to cloud, just open your app and scan the code. Exporting into demo package is also a rare but useful function which Mockplus has. Reportedly, Mockplus: 2.2 beta version will have the function exporting into HTML, and the launch of 2.2 version should come soon. The HTML exporting of Mockplus has two ways: first one is to export offline package. You could send this package to your colleagues directly or put it on the local sever for downloading and preview. The second way is online HTML previews. After publishing the HTML online, you could send a link to people who want to have a preview of your prototype.
Pro Visualized interaction & ready-made UI components
The interactive design in Mockplus is fully visualized, that's WYSIWYG. With a simple drag-and-drop to build interactive prototypes effortlessly. A set of pre-designed components, including pop-up panel, stack panel, scroll box, sliding drawer and image carousel, make you create fully interactions faster and easier.