Can a smartphone app keep heart failure patients out of the hospital?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Age 18 years and older at screening 2. Currently admitted or discharged from the hospital within the last 14 days with a diagnosis of acute or acute on chronic decompensated HF. 3. Based on one of the EF criteria (LVEF within 12 months of randomization. BNP or NT-proBNP criteria within 30 days prior to randomization): * Left ventricular ejection fraction (LVEF) ≤ 40%. * LVEF \>40% and BNP \> 175 pg/ml or NT-proBNP \> 700 pg/ml. Thresholds for NT-proBNP and BNP for LVEF \> 40% will be corrected for body mass index (BMI) using a 4% reduction per BMI unit over 25 kg/m2. 4. Have a personal physician for follow-up 5. A smartphone with a compatible Apple or Android operating system installed and able to download and use ManageHF including accepting all permissions 6. A valid email address 7. Fluent in spoken and written English Exclusion Criteria: 1. Contraindication to recommending a sodium restriction diet 2. Scheduled intervention for primary valvular heart disease will occur during the study period. 3. Cardiac resynchronization therapy (CRT) within 3 months prior to screening or current plan to implant CRT device during the study period. 4. Dialysis 5. Previous cardiac transplantation or implantation of a ventricular assistance device or similar device. 6. Listed status 1, 2 or 3 for heart transplant 7. Implantation of a ventricular assistance device is expected within 3 months after randomization 8. Non-cardiac illness with expected survival of less than 3 months 9. Discharge to a setting other than home 10. Requirement for chronic inotropic therapy (e.g. milrinone, dobutamine) 11. Inability to use Withings devices due to equipment limitations or contraindications 12. Currently pregnant or intend to become pregnant during the study period.