Mobile digital libraries are a category of mobile applications with significant relevance in the educational context, providing various digital content and learning resources accessible via mobile devices. These platforms aim to enhance learning by offering quick access to books, academic articles, multimedia materials, and other educational resources. To fully realize this potential, digital libraries must incorporate pedagogical and usability principles. In this context, the Graphical User Interface (GUI) plays a fundamental role in ensuring the effectiveness of mobile digital libraries. This study describes the development process of a GUI for a mobile digital learning library in the field of digital health. The research followed a descriptive approach, beginning with the collection of user requirements and the conduction of user surveys to identify their needs. The platform's functionalities were then defined, followed by the creation of sketches and wireframes for the interface. Subsequently, the visual design was developed, and the interface was implemented, integrating the planned functionalities. Accessibility criteria were applied throughout the process, including the integration of VLibras, subtitled videos, Brazilian Sign Language (Libras) windows, accessible fonts, and podcast transcriptions to ensure inclusivity. An analysis of the mobile digital health library revealed an organized interface that enables access to educational and institutional content, fostering digital literacy, data protection awareness, and citizen engagement in health management. The application contributes to digital transformation and the strengthening of collaborative management through digital resources such as PDFs, videos, infographics, and podcasts. The interface structure includes a loading screen displaying the app's logo, reinforcing the visual identity with the brand’s colors. The registration process is streamlined, requiring only essential information such as name and email address. The home screen presents introductory information about the library and features a bottom navigation menu for easy access to the home, resources, favorites, downloads, and profile sections. The digital resources section organizes content into categories, with each item displaying a title, standardized cover, brief description, and action buttons for resource access, including a download option. Easily recognizable icons indicate functions for downloading, favoriting, and sharing content. In the favorites and downloads sections, saved resources are efficiently organized, ensuring easy access to previously downloaded content. Additionally, the evaluation system allows users to rate materials, supporting content curation and the continuous improvement of the digital library's quality. The project, structured in development and evaluation phases, ensures the creation of an intuitive and efficient platform that facilitates access to educational and institutional content in the health domain. By applying best design practices and incorporating resources such as PDFs, videos, infographics, and podcasts, the platform contributes to the digital transformation of health management, offering a collaborative and accessible tool.

Keywords: Digital libraries, digital health, educational technology.