Located in the San Francisco Bay area, SFCD develops applications for clients in diverse niches such as retail, finances and marketing. Being so close to Silicon Valley, this web design agency has adopted some of the local technology that is known on a global scale. For example, SFCD builds apps for devices that run on iOS, which is Apple's signature operating system. Apple's main headquarters is located right in the heart of the San Francisco Bay region. Therefore, this web design firm closely follows all of the innovations that come out of such a high-tech epicenter. When building iOS apps, SFCD uses a combination of open source and closed source technology. For the most part, Swift is utilized to lay the building blocks of solutions for iPhones and iPads. This is a programming language that has been licensed by Apple. Swift can also work well with other open source tools such as C+ and jQuery.