R&D Study to Evaluate Cordio's Usability and to Collect Patient Speech Utterances

Major inclusion Criteria: 1. Adults patients 2. Diagnosed with Symptomatic Chronic Heart Failure \[NYHA II-IVa (ambulatory)\] 3. At least one of the following: 1. One ADHF hospitalization in the last 12 months 2. One unplanned IV/SC diuretic administration in the last 6 months 3. Two unplanned IV/SC diuretic administration in the last 12 months 4. NTProBNP \>500 pg/ml or BNP\*\> 150 pg/ml at screening visit 4. Clinically stable HF 5. Willing to participate as evidenced by signing the written informed consent. 6. Male or non-pregnant female patient (pre-menopausal women will confirm verbally). Major exclusion Criteria: 1. Not able to read in Hebrew, Russian, Arabic, English and/or Spanish. 2. Unable to comply with daily use of the App 3. Major cardiovascular event 4. Had a Cardiac Resynchronization Device (CRT) implanted or upgrading ≤ 1 month prior to screening visit. 5. Has estimated Glomerular Filtration Rate (eGFR) \< 30 ml/min/1.73 meter square (Cockroft-Gault formula). 6. Is likely to undergo heart transplantation/ LVAD within 6 months of Screening Visit.