My S8 has a "Samsung Health" app, that measures Oxygen Saturation under the "Stress" section. It uses the sensor next to camera (also used for Heart Rate). I've

My S8 has a "Samsung Health" app, that measures Oxygen Saturation under the "Stress" section. It uses the sensor next to camera (also used for Heart Rate). I've no idea how accurate it is though. Some googling and I found a related paper: "Accuracy of Smartphone-Based Pulse Oximetry Compared with Hospital-Grade Pulse Oximetry in Healthy Children" DISCUSSION AND CONCLUSIONS: Smartphone-based pulse oximetry is not inferior to standard pulse oximetry in pediatric patients without hypoxia. [1] However in this case you _are_ trying to test for hypoxia... Another link answering the question "Should smartphone apps be used as oximeters": CONCLUSIONS It is not physically possible to measure SpO2 using current smartphone technology. The two published studies which assessed smartphone oximeter apps (Digidoc and Samsung) raise serious questions about the diagnostic accuracy. The Samsung app has been withdrawn, and the claim that oxygen saturation can be measured indirectly through “stress assessment” is false. [2] [1] https://www.ncbi.nlm.nih.gov/pubmed/29215972 https://www.ncbi.nlm.nih.gov/pubmed/29215972 [2] https://www.cebm.net/covid-19/question-should-smartphone-apps-be-used-as-oximeters-answer-no/ https://www.cebm.net/covid-19/question-should-smartphone-app...