Heart rate: the stronger use case
rPPG can identify a repeating pulse signal from facial video. Across research studies, heart-rate estimation is generally the most mature contactless measurement. Accuracy still depends on movement, lighting, camera performance and signal quality.
A number is only useful when there is enough usable signal. Follow the quality guidance and repeat a failed scan under better conditions.
Blood pressure: an estimate, not a cuff measurement
A standard upper-arm monitor inflates a cuff and detects pressure changes in an artery. A camera does not do that. Camera-based products use characteristics in the pulse signal, sometimes with personal information or calibration, to generate an estimate. Reviews identify important variation between methods, study populations and real-world conditions.
Treat the blood-pressure number as an estimate. Check the scan quality and consider the limitations before interpreting a result.
How to act on a result
One camera estimate should not be used to diagnose high or low blood pressure. If a result is unexpected, rest and repeat it. If it remains concerning, confirm it with a validated upper-arm monitor and follow local healthcare guidance. If you feel acutely unwell, do not wait for a camera scan or use it to decide whether to seek urgent help.