Introduction Older adults with heart failure (HF) are at high-risk for hospital readmission within 3 months post-discharge. Promotion of self-care can lead to a reduction of HF-related hospital admissions. Weight monitoring is a key element to HF self-care. We previously demonstrated that a standardized diuretic tool (SDDT) can improve HF management for patients and informal caregivers (CPs), compared to usual care. We aim to adapt the SDDST into an electronic application (app). We previously conducted a qualitative study with patients and CPs to understand their self-care challenges and perception of technology. We developed a questionnaire based on these study results to assess use of technology in older individuals with HF. Hypothesis The objective of this study was to identify patient needs when using a HF related self-care app. We hypothesize that the HF application questionnaire (HFAPPQ) will show that patients find self-care challenging and would be likely to use a HF application (HFApp) to support self-care. Methods We developed the HFAPPQ based on the results from our previous qualitative interviews with older patients and their CPs. From these results, we developed 55 questions and identified 6 domains: usability, communication, app customization, complexity of self-care, usefulness of HF info, long-term use and costs. Patients with a primary diagnosis of HF, English speaking, aged >60 years were eligible to participate. A total average score and an average score for each domain was calculated. We calculated an intra-class correlation coefficient (ICC) for each question to determine their overall contribution to total score. Questions with an ICC < 0.1 were removed. We obtained approval from our local research ethics board to conduct this study. Results A total of 66 patients completed the questionnaire. Patients were recruited from the outpatient clinic and from the inpatient cardiology ward from June 2019 to March 2020. The mean age was 74.0 (SD: 8.1), 49% of patients were males, the mean left ventricular ejection fraction was 40.1% (SD: 13.0). Eight questions were removed from the HFAPPQ (ICC < 0.1). The mean scores for the sub scores (usability, communication, app customization, complexity of self-care, usefulness of HF info, long-term use and costs) and the total score were 57.0 (SD: 17.0), 19.0 (SD: 5.0), 15.0 (SD: 5.8), 8.9 (SD: 2.6), 50.0 (SD: 13.0), 14.0 (SD: 3.4), and 164.0 (SD: 33.0) respectively. Conclusion Our results demonstrate that older patients with HF found self-care moderately complex, were neutral towards customizing the HFapp and did not see an HFapp as being particularly useful. Despite this, participants showed interest in using the HFapp for self-care and demonstrated some proficiency in using technology. Furthermore, participants showed a high interest in incorporating the HFapp in communication with healthcare professionals. Future directions include conducting usability trials to test for ease of use as well as incorporating nurses and volunteers to aid in the HFapp uptake.