| Sumario: | Objective: To describe the process of developing and evaluating a mobile application prototype to enable people with complex communication needs to call pre-hospital emergency services. Methods: This methodological study was conducted in three stages: determining the target population's functional requirements; developing and making available a prototype application for touchscreen mobile phones to request pre-hospital services; experts assessed the usability heuristics using a checklist, while the target population (people with complex communication needs) used the System Usability Scale. Descriptive statistics were performed, and the scores assigned to the application were analyzed. Results: The application obtained high usability scores (mean=58.75) and 21 individuals from the target population reported an excellent user satisfaction index (mean=89.5), which allowed registering and applying for the prototype's patent. Conclusion: The prototype showed the ability to enable individuals with complex communication needs to access and request pre-hospital emergency services.
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