S1 Eye-TrackerAccurate, affordable and portable. The S1 eye-tracker is capable of determining in real time where on a computer screen a user is looking. The S1 is: • Accurate: Advanced computer algorithms track both eyes, offering a point-of-gaze measurement that is accurate to within 1 degree.• Simple to Use: Setting up the S1 takes less than a minute, the bundled software is intuitive, and working with the S1's API is quick and easy. • Affordable: The S1 is priced so that multiple computers may be outfitted with eye trackers at a low cost. This allows for faster team software development and faster test subject throughput. Academic and volume discounts are available. • Portable: The S1 is less than 40 cm long, and can fit in a laptop bag. It is not fragile and easy to transport. • Unobtrusive: The S1 does not require any head mounted equipment, nor does it require any large or heavy support hardware. It is a lightweight solution that can be used with existing equipment and leaves users at ease. S1 Hardware and is small enough to fit in a laptop bag. The S1 is a small USB device that takes less than a minute set up. The S1 sits unobtrusively below the monitor, facing the user. It uses advanced computer vision algorithms to track the eyes and produce point of gaze data at a rate of 60 times per second. The small and light hardware package makes the system easily portable between machines or locations. The fact that the system does not require a custom monitor or embedded computer allows it to run entirely on existing hardware, keeping costs down and allowing the flexibility of monitor choice. S1 Software: ObserverThe S1 comes with the program Observer, which is used to monitor, track and record eye-gaze data. As a subject uses a computer equipped with the S1, Observer can be used to record a video of the on-screen activity which includes exactly where the user is looking. By using a second monitor, this video can even be shown as it is being recorded. Below is a video recorded by Observer while a user read a news website. Adobe Flash Player not installed or older than 9.0.16!
 A video recorded by the S1 Observer software. The red circles indicate where the user is looking, and the small green dot is the mouse. For more information on Observer, see the Observer page. S1 Software: APIThe S1 eye-tracker can also be integrated into a custom programs via a software API. This allows for eye-gaze to be integrated with custom testing suites, or even used as a control tool in novel human computer interfaces. The API is implemented using the TCP/IP protocol, which allows any program written in a modern programming language (including C/C++, C#, Java, Visual Basic, Python, Delphi, Matlab) to interface with the S1. Integration of eye-gaze with custom applications can be achieved in as little as 30 lines of code, and if desired the data can be sent in realtime to a second computer running different operating systems (Mac/Linux/Other). For more information, see the API page. Example SetupThe portable eye-tracker can be used with desktop or laptop computers. The eye-tracker should be placed centered below the computer screen and angled upwards towards the users face. The following video illustrates the setup of the S1 eye-tracker on a laptop computer.
Applications of Eye TrackingThere are many applications for low cost eye tracking, however we have highlighted three showing how the S1 can be used within each context:    Technical Specifications
System Requirements
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