Question 1

How does the 30-second face scan actually work?

Accepted Answer

Cira uses Shen AI's remote photoplethysmography (rPPG) to analyze tiny color changes in your skin caused by your pulse. Your device camera records about 30 seconds of your face in good lighting, and the SDK estimates heart rate, breathing rate, heart-rate variability, and blood-pressure trends — all processed on your device.

Question 2

Is the scan private? What happens to the video?

Accepted Answer

Yes. The face-scan processing runs locally in your browser using Shen AI. Cira calculates vital signs from the video stream and does not store raw face video — image frames are discarded after processing. Only the resulting numerical vitals are saved to your account if you choose to keep the scan.

Question 3

How accurate is the AI nurse and the vital signs?

Accepted Answer

Shen AI's vitals engine is clinically validated against medical-grade devices and uses neural 3D face tracking with rPPG/rBCG sensor fusion. Cira's clinical reasoning is built on Claude-class models trained on billions of medical data points. Cira is an AI nurse — it offers guidance and a doctor hand-off, not a diagnosis. It does not replace a licensed physician.

Question 4

What devices and browsers do I need?

Accepted Answer

Any modern device with a front-facing camera and a recent version of Chrome, Safari, Edge, or Firefox. Good, even lighting on your face makes the scan more accurate. No app install, no wearable, no external sensor required.

Question 5

Do I need an account to try Cira?

Accepted Answer

No. You can start a free chat or run a guest face scan without creating an account. An account lets you save scans, track trends over time, and share a Cira report with a doctor through our Air Doctor partnership.

Question 6

Can Cira connect me to a real doctor?

Accepted Answer

Yes. Through our partnership with Air Doctor, Cira can hand you off to a network of 20,000 licensed doctors across 180 countries. Your Cira summary — symptoms, history, and vitals — travels with you so you don't have to repeat the basics.