One, IPhone mockup
http://iphonemockup.lkmc.ch/
You can draw a simple wireframe (illustration) and a freehand style wireframe (Pencil) with two styles of prototypes. The components can be dragged arbitrarily and put in the right place. However, because it is online software, there may be some deficiencies in security, and some similar to the form of sand table, do not know when it will disappear. The advantage is that it can be created in concert.
Second, Balsamiq mockups
http://www.balsamiq.com/
The Balsamiq mockups offers 9 large classes of more than 50 controls, covering almost every common UI control. Whether it is desktop software, mobile software or Web site, can be done, and software is very easy to start. Balsamiq Mockups has many deficiencies, such as the inability to create interactive effects, can not be repeated to make a module to use the region. However, the free version of Balsamiq mockups has many limitations, such as the inability to save, the export of prototype map is extremely inconvenient. And the fee version needs $79, it is too high. But there are 5 ways to get license key for free, and you can go to its website to study it.
Third, the IPhone Sketch Pad
http://www.uistencils.com/
This is a paper prototype template, like the kind of complex drawing board we used as a child, the difference is that it integrates some of the iphone's common buttons, input boxes, component styles, and can easily draw the contours of the iphone. There is a grid line, but also to send a white board, of course, this thing is required to buy, 9.95 dollars.
Four, Axure
http://www.axure.com/
Axure RP has become an important tool for the successful design of Web prototypes, and the most common prototyping tools used by product managers, although Axure has the advantage of Web prototypes, but it is also easy to design mobile prototypes and interactive effects with the introduction of some components, which for those who are adept at using Axure, Basically does not need any study cost, therefore is also one kind of comparison recommendation tool.
In fact, I personally prefer to use PPT, Photoshop this very traditional tools, but sometimes in order to show the need for the effect, do need some better means. Want to know the phone prototype design friends continue to recommend the appropriate tools to learn together ...