Vital Signs Screening Should Not Require a Supply Chain
We are building the tools that let every community health worker screen for vital signs using the smartphone they already carry — no equipment, no consumables, no infrastructure
Why We Built This
Billions of people live in settings where basic vital signs measurement is unavailable at community level. Not because the science does not exist, but because the equipment does. Pulse oximeters break. Blood pressure cuffs need calibration. Thermometers need batteries. Every device adds a procurement line, a maintenance burden, and a point of failure.
We started with a question: what if the smartphone that community health programs are already distributing could replace the equipment bag? Remote photoplethysmography — extracting cardiovascular signals from a camera — had been demonstrated in controlled settings. The challenge was making it work in the field.
We built for the constraints that define low-resource deployment: intermittent connectivity, low-cost devices, high ambient temperatures, varied lighting, and health workers with no biomedical training. Every design decision flows from field reality, not laboratory conditions.
Today, Circadify is used by global health programs to screen populations that traditional equipment cannot reach. We measure our success not in app downloads, but in the number of people who get their vital signs checked for the first time because a CHW had a smartphone and 30 seconds.
Our Mission
To eliminate equipment as a barrier to vital signs screening in low-resource settings. We believe every community health worker should be able to screen for basic vital signs using nothing more than the smartphone in their pocket — and that the data should flow seamlessly into the health systems that need it.
Design Principles
Field-First Design
Every feature is tested against the realities of community health work: no connectivity, low-cost devices, outdoor conditions, and health workers who have 30 minutes of training. If it does not work in the field, it does not ship.
Zero-Equipment Philosophy
We refuse to add hardware dependencies. No dongles, no cases, no Bluetooth peripherals. The moment you require an accessory, you have created a supply chain problem that undermines the entire value proposition.
Data That Flows Upstream
Screening data is only valuable if it reaches decision-makers. We build integration-first, ensuring that community-level data flows into DHIS2, program dashboards, and national reporting systems without manual aggregation.
Honest About Limitations
Smartphone screening is not a replacement for clinical diagnosis. We are transparent about what rPPG can and cannot do, because implementers making deployment decisions deserve accurate information, not marketing language.
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