This article deals with the main features of accessibility implemented by a mobile operating system, this in order to become the basis for subsequent research related to this subject, showing each attribute of accessibility of the evaluated systems which are currently the mobile platforms most common in the market. In order to achieve this accessibility attributes were identified and categorized according their orientation (visual, aural, locomotion and other); after this were established the functionalities implemented by each of the analyzed platforms, which resulted in a better result for Android and iOS. Finally, through a comparative evaluation is showed the degree of accessibility of each of the evaluated operating systems, this in order to verify which of them offer a higher level of accessibility regarding the identified features, the results showed that Android operating system is the one that implements a higher percentage of these features compared to their counterparties.