IntroductionSurgery plays a critical role in global health, often facing significant quality challenges such as high rates of postoperative complications, variability in patient outcomes, and inconsistencies in care pathways, due to the complex nature of the perioperative journey. The My Surgical Pathway (MSP) app is an e-health intervention designed to address these challenges by supporting self-management and integrated care throughout the entire perioperative journey. This study aims to describe the features and functions of MSP and report on the results of usability testing from both patients and healthcare workers. MethodsThis mixed-methods study evaluated the usability of the My Surgical Pathway (MSP) app using quantitative surveys, qualitative feedback, and observation data from patients and healthcare workers. Structured 2-hour user testing sessions included interaction with the MSP app, completion of the User Version of the Mobile Application Rating Scale (uMARS), and think-aloud activities. Data analysis combined quantitative and qualitative insights to identify usability issues and inform potential improvements. ResultsThe mixed-method user-testing evaluation of the co-designed e-health intervention revealed high overall app quality scores, with an average of 4.50 out of 5. All user-type interfaces received mean scores above the minimum acceptability threshold of 3.0, demonstrating the intervention's efficacy in supporting patient surgery journeys, enhancing healthcare worker coordination, and meeting diverse user needs. Notably, the highest individual item scores were for credibility of source (4.92) and interactivity (4.85), highlighting the application's reliability and engaging nature. ConclusionsThe study evaluated the 'My Surgical Pathway' (MSP) e-health intervention, co-designed with consumers and healthcare workers to support self-management of surgical care. Results indicate high user satisfaction, with an overall app quality score of 4.50 out of 5 on the uMARS tool. Users praised MSP's engagement, education, and responsiveness, highlighting its potential to improve patient experiences and clinician workflows. Recommendations for future research include expanding participant diversity and hospital settings, and employing longitudinal designs for a comprehensive evaluation.