Proto.io – This is the right tool for mobile prototyping and wireframing because it allows you to view the prototypes offline. Also it comes with a lot of mobile widgets.
Mockplus – this tool is great for mobile prototype creation thanks to 200 components and 3000 icons and the simple drag-and-drop interface. Also you can select a mobile template based on the screen size.
Fluid – this is a web-based tool for wireframing and very interesting for creation of a mobile application prototype (including iOS and Android and wearable devices).
Pixate – this one is desktop-based, also a prototyping tool. But with this tool you can build animations and improve the prototype with interactions.
Justinmind – also a desktop-based prototyping tool
So these were just a few of the best prototyping tools for app development. And again, you decide which tool is best for you. There is just not one tool which is better than all the others for all developers regardless what they develop / how experienced they are / if they work alone or in a team / etc. Sorry, you need to select the best tool for app development by yourself.
Also we have a nice infographic for app developers. This infographic shows 10 of the best tools that are ideal for mobile app developers. On the infographic we see again the tool FLUID, JUSTINMIND, PROTO.IO. But also some others like MARVEL, INVISION and AXURE for example. All great tools for you to try and explore. You can read and share the infographic to help other mobile app developers. I will describe a few of these prototyping tools including the links to the sites.
Interested in creating your own app? Want to start with app development? Then you should read our article Using java to develop Android apps with a simple tutorial for beginners.