Yes, blood oxy is easily derived that way, but we were not interested in making a device that had that level of medical accuracy and application. (maybe in futu

Yes, blood oxy is easily derived that way, but we were not interested in making a device that had that level of medical accuracy and application. (maybe in future version...?) We just wanted a simple heartbeat sensor with simple interface for hackers. That said, you can get relative blood oxy concentration. A couple of deep breaths will shift the waveform up ~20 points on our visualizer, for example.(I'm a co-creator of Pulse Sensor)