The purpose of this study was to identify salient features for a critical thinking app and create an instrument to facilitate the app evaluation and selection process. Two questions guided the study: (1) What distinguishes critical thinking instructional apps from others? and (2) What design principles are essential to develop a critical thinking instructional app? The study was conducted in two phases, including a synthesis of existing research in Phase I and development of an evaluation instrument in Phase II. Three lines of research (on critical thinking, educational apps design principles, and tools for the evaluation of educational apps) informed the development of the instrument, which included three evaluation categories (content, pedagogy, and design). A synthesis of research used to create the instrument is included herein along with the instrument design process, rationale for this design, recommendations for usage, its limitations, and implications for future practice and research. Findings will enable app users to more wisely select critical thinking apps specific to their needs and assist app developers with distinguishing the salient qualities required to design apps for critical thinking. The study accordingly contributes to both software evaluation and its development with findings beneficial to both app users and developers.

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