The Montreal Cognitive Assessment (or MoCA) was designed as a test to screen for mild cognitive dysfunction and assesses the following cognitive domains: attention and concentration, executive function, memory, language, visuoconstructional skills, conceptual thinking, calculations, and orientation. This test only takes about ten minutes to complete, but previously the test has only been given as a paper version. The MoCA App is an iOS application specifically designed for digital use with goals of a functional prototype and future testing trials using this prototype. Using Apple software and applications development tools, we developed this application for use in testing via Apple iPad. The app is currently in a functional state but could be extended in many ways to increase both ease of use and further completeness of functionality.