To enter the world of work, students require skills which include flexibility, critical thinking, problem solving, collaboration and communication. The use of mobile technologies which are specifically created for a context could stimulate motivation in students to recognise the relevance of Mathematics in the real world. South Africa in particular is a suitable location to use mobile learning across distance due to its viability, affordability and availability as opposed to web-based technology. The design team developed an app for financial Mathematics based on the principles of realistic mathematics education (RME) for mathematics teachers to use with their students. The paper describes the design process and general usability aspects of the formative evaluation of the prototype app for financial Mathematics. The authors suggest that a graphic artist becomes part of the design team to enhance the visual attractiveness of the app. [For the complete proceedings, see ED579190.]