Automatic Data Collection
Weight and blood pressure measurements are synchronized from compatible smart medical devices through vendor integrations.
Harvard Extension School · Capstone Project
CHF Companion
Smart Home Monitoring for Heart Failure Patients
CHF Companion is an individual Computer Science Capstone Project exploring the design and development of a mobile health application for Android and iOS that supports home monitoring of patients living with congestive heart failure.
The application combines automated weight and blood pressure collection, longitudinal health tracking, an observation diary, and structured reporting for healthcare consultations.
The Challenge
Managing Heart Failure at Home Is Difficult
Heart failure requires consistent monitoring between healthcare visits. Weight and blood pressure measurements, together with information about symptoms and daily observations, can provide important context for understanding changes in a patient's condition.
6.7 Million
Americans living with heart failure
11.4 Million
Projected prevalence by 2050
Hospitalization
A leading cause among older adults
01
Patient
Daily measurements, symptoms, and observations.
02
Between Visits
Information may be kept in paper notes or fragmented records.
03
Clinician
Limited longitudinal context may be available during consultation.
Inconsistent tracking and fragmented information can make it difficult to understand how a patient's condition changes over time.
The project explores how technology can make daily monitoring more structured, connected, and accessible.
Project Goal
Designing a Better Approach to Home Monitoring
The goal of CHF Companion is to design and develop a mobile application that enables patients with congestive heart failure to monitor weight and blood pressure, automatically synchronize measurements from compatible smart devices, visualize long-term trends, maintain an observation diary, and generate structured reports for healthcare professionals.
Automatic measurement collection
Historical trend visualization
Observation diary
Structured health reporting
The Solution
CHF Companion
CHF Companion brings measurements, observations, historical trends, and reporting together in a single mobile application designed to support structured home monitoring.
Longitudinal Trends
Historical measurements are organized and visualized to help users understand changes over time.
Observation Diary
Users can record contextual observations alongside objective measurements.
Structured Reports
Measurement history, charts, statistics, and observations can be compiled into reports for healthcare consultations.
Caregiver Support
The application supports family caregivers who assist patients with monitoring and reviewing health information.
Who We Designed For
Supporting Patients and the People Who Help Them
CHF Companion is designed for two primary user groups who work together to support consistent home monitoring.
Independent Patients
Older adults living independently with heart failure who need a simple and accessible way to review their health information at home.
Primary needs: automatic measurement collection, clear trends, simple navigation, and easy access to health history.
Family Caregivers
Family members or patient assistants who support daily monitoring when a patient needs additional help using the application.
Primary needs: access to monitoring information, straightforward workflows, and a clear view of measurements and observations.
Application Prototype
See CHF Companion in Action
The CHF Companion mobile application prototype demonstrates the core workflows for home monitoring, including health data visualization, observation tracking, reporting, and connected device management.
CHF Companion Mobile Application · Prototype Demonstration
Technology Stack
Technologies Behind CHF Companion
CHF Companion uses C# and .NET 10 across its application components, with .NET MAUI for Android and iOS, Blazor WebAssembly for the Web Portal, and ASP.NET Core for backend and integration services. Both clients communicate exclusively with the Backend REST API, while a separate Withings integration service manages device authorization and measurement synchronization.
Mobile
Android
iOS
.NET MAUI
C#
.NET 10
XAML
Web Portal
Blazor WebAssembly
HTML
CSS
JavaScript
Backend
ASP.NET Core Web API
REST
ASP.NET Core Identity
Bearer Authentication
HTTPS
Data
Entity Framework Core
Azure SQL Database
Device Integration
Withings API
OAuth 2.0
Webhooks
Periodic Synchronization
PDF Reporting
PDFsharp
Testing
xUnit
WebApplicationFactory
EF Core InMemory
Cloud & Delivery
Azure App Service
Azure Static Web Apps
Azure Communication Services Email
Azure DNS
GitHub
GitHub Actions
Project Status
From Implementation to User Testing
The core CHF Companion functionality has been implemented across the Android and iOS applications, Web Portal, backend services, and Withings integration. The cloud environment is deployed, and the project is now focused on user testing, regression validation, and preparation for the final Capstone release.
System Design
Completed
System architecture, service interfaces, and data models are documented and maintained as the solution evolves.
Mobile Application
Available for Testing - Android & iOS
The Android and iOS applications include measurement trends, an observation diary, PDF reports, patient profiles, account management, and connected devices. The iOS version is available for testing through TestFlight.
Web Portal
Live / Available for Testing
The browser-based portal provides access to the same core functionality through the shared Backend REST API.
Backend & Integrations
Implemented
Backend services and Withings integration are implemented, including email verification, OAuth authorization, token refresh, webhooks, and periodic synchronization.
Cloud Deployment
Completed
The Backend API, Withings service, databases, project website, and Web Portal are deployed on Microsoft Azure.
Testing & Validation
In Progress
Automated backend service and API tests are implemented. User evaluation, regression testing, and final project validation remain the current focus.
Last updated:
About the Project
An Individual Computer Science Capstone Project
CHF Companion is an individual Computer Science Capstone Project developed at Harvard Extension School.
The project explores the design and implementation of a mobile health monitoring system that combines software architecture, mobile application development, backend services, connected medical device integration, and health data reporting.
Project
CHF Companion
University
Harvard Extension School
Program
Computer Science
Developed by
Anna Koriakovskaia
Project Supervisor
David Platt
Year
2026