This article reports on the development of a mobile app developed to encourage healthier lifestyles, with emphasis on food intake, by people with Down’s syndrome. The system started by considering generic guidelines on designing technology for people with Down’s syndrome investigated by a previous European project. Then, it developed the product using the User-centred Intelligent Environments Development Process, an iterative method of gathering stakeholders’ views to involve them in co-designing the product. The project produced a mobile app which was validated with the intended final users and gathered positive feedback. The experience also provides further insights which can inform developers of future similar technological solutions.