The range of web tools that are available today can help with a variety of options on different design initiatives you decide to embark on at any time. You can access ready help on building a website, designing a logo or starting off a blog.
When you have access to prototyping tools, you can resolve some challenges about designs even  when you do not have a grasp of coding. Prototypes help to give life to your ideas so that you easily alter the way you view designs and concepts.

Prototypes can help you convey ideas to clients so that they can grasp them readily even if it means altering the forms and outlook. Here is an outline of prototyping tools that modern web developers will find useful:

1. Antetype

Antetype is a prototyping app that suits the Mac such that mobile apps, software and websites can be created with a responsive slant. There are several templates available in the Antetype that fits a lot of devices and there are as much as 400 widgets that are available for your use.
The layout is easy to work with as they are dynamic and no matter the need to resize or drag the elements, your intent will be realized. All the needed tools are available within this app for you to streamline shadows, rounded corners, gradients and other features. It is possible to generate your CSS code and view your projects on pixel-driven graphics or vectors.

2. Moqups

Moqups derives its name from mockups and it is a prototyping tool that makes the job of creating mockups hassle-free. It comes with 31 components in the free version that include figures, icons, graphs as well as iPhone mockups.

There is allowance for you to make use of your self-generated images, which you only need to upload to the app. Using the premium version enables you to work on multiple projects , create Master pages , engage your team and add changes by commenting on the created fly. There is easy export means to pdf or a png file.

3. Balsamiq

Rapid prototyping is made easy when you use the Balsamiq and it utilizes an approach similar to the normal freehand sketches to create mockups.
There are over 500 ready-to-use icons and other items in the library that you can easily call up. You can interact, share and modify prototypes along with members of your working crew.

4. Marvel

Marvel is another prototyping tool that enables you to create prototypes of mobile apps and websites. You can upload your files to this medium from your gifs, jpg, png or psd files or upload images directly from your handmade sketches.
Part of the unique allure of Marvel is the window to turn static screens to interactive, clickable prototypes using transitions, gestures and animations. You are also allowed a view of what is going on in the Marvel community.

5. Axure

In the Axure, responsive websites and a range of mobile apps can be created with in-built responsiveness. Interactions and Master pages can be added as you desire while you access ready widgets from the library.

There is room for colors, gradients and images to be imported and utilized, just as the transparency blend of objects can be altered to your taste. There is an overwhelming range of options you can use on the interface although this might look daunting at first. Help is also available on the Axure Blog and Forum to sort out little details on functionality and approach.

There is free version and paid versions with this app and you can go past the limitations when you sign up for premium.

6. Proto.io

More help is available for mobile apps and website design with the Proto.io, which also comes with an extensive library. There is room for items to be stylized freely and when you desire, you can share same via Dropbox so that others can have access as you wish.

There is also help for UI from the library and when you are through with your prototype, it is easy to share, test and also access feedback from the app community tagged -Proto.io Spaces.
Access is free over the first 15 days and you need to go premium afterward.

7. Flinto

Flinto comes with dual functionality in mind and this suits mobile apps as well as web-based prototyping. Your ready-to-use files can be dropped to the app along with intended interactions which can be easily linked thereafter. Add up icons and your startup screen, and you will be ready to go.

When you are through with the features you want to be in place, the project can be shared as you desire. The mobile device range is perfect when you desire to view projects completed here by installation and testing. Any changes you make can be tracked and tweaked as you may wish.