Questions From Global Health Decision-Makers

Circadify runs on Android 8.0 and above and iOS 14 and above. The app is optimized for entry-level Android devices commonly distributed in community health worker programs across Sub-Saharan Africa. No high-end processor or specialized camera hardware is required. If the device has a functioning front-facing camera, it can run the screening workflow. We maintain a tested device list for common CHW program handsets and can validate compatibility with your fleet before deployment.

Circadify is built offline-first. The entire screening workflow — capture, processing, and results display — runs locally on the device with no internet connection required. Screening results are stored in local encrypted storage and sync automatically when the device connects to WiFi or mobile data. This means CHWs can conduct full screening sessions during multi-day village outreach trips with no connectivity and data will sync when they return to a health facility or connected area. No screening data is ever lost due to connectivity gaps.

All biometric signal processing happens entirely on the smartphone. No facial images, video frames, or raw rPPG signals ever leave the device. Only derived vital signs estimates — numerical values like heart rate and respiratory rate — are stored locally and available for sync. This architecture was designed specifically for programs operating under strict data sovereignty requirements and ensures compliance with national data protection frameworks across the jurisdictions where we deploy. No biometric data passes through external servers at any point.

Yes. Circadify screening data can be exported in standard formats compatible with DHIS2, CommCare, and other health information platforms commonly used in Sub-Saharan African health programs. We work with implementation partners during the deployment planning phase to configure data export pipelines that map to your existing indicator frameworks, reporting hierarchies, and district-level dashboards. The goal is to add screening data to your existing workflows rather than creating a parallel reporting system.

CHWs can begin screening after a single training session of approximately one hour. The training covers device positioning, lighting requirements, the guided scan workflow, and how to interpret and record results. The app itself provides step-by-step on-screen guidance during each scan, reducing the knowledge burden on the CHW. We provide standardized training materials in English, French, and local languages upon request, along with train-the-trainer packages for program supervisors who will onboard additional CHWs as the program scales.

The Circadify app is free to download and use with no per-screening fees, license costs, or subscription charges. There is no equipment to procure because the screening runs on smartphones CHWs already carry. For qualifying global health programs, we provide deployment support, training materials, and integration guidance at no cost through our partnership model. The primary cost consideration for implementing organizations is staff time for training and any data integration work with existing health information systems, which varies by program complexity.