The internet is a prominent source of health information for the public. This research evaluated both basic use and design tenets and the presence of theoretical components to motivate healthy breast cancer behavior for users of the most frequented breast cancer websites. Methodology: Each website was evaluated with 2 sets of questions. The first attends to the basic use and design tenets of the website. The second coding form assessed the websites use of 3 behavior change theories. Results: The majority of the websites fared well with regards to their use of basic tenet and design principles. Theoretical components were used sparingly on the majority of websites. Discussion: The most frequented breast cancer websites are currently well equipped with basic use and design tenets. However, their lack of behavioral change components is likely to impede users’ motivations to protect themselves against breast cancer.