Traditional ECG and 24–48-hour Holter tests often miss intermittent arrhythmias due to short monitoring windows and bulky devices that limit patient adherence. Limited guidance on recording quality and troubleshooting further leads to incomplete data and added clinician workload. Kardi AI offers a digital-first, AI-enabled solution for long-duration ECG monitoring through a medical-grade chest strap and intuitive mobile app. The platform provides continuous heart-rhythm data and real-time insights, supporting better recording quality and a more comfortable, patient-centered experience. This HITLAB heuristic evaluation assessed the usability and overall experience of the Kardi AI system using Jakob Nielsen’s Ten Usability Heuristics. Findings show strong usability and functionality, with recommendations to enhance real-time feedback, recording guidance, and error prevention to further improve accuracy, trust, and sustained engagement.