The Instagut app’s algorithm reads the subtle changes in your Photoplethysmography (PPG) technology data and, based on scientific research findings, provides results about your instinctual reaction/response to anything that you put your mind to. Gain confidence when making decisions by tapping into your gut-instinct, proved by scientific studies in the fields of biology and neuroscience. You need to do a one-time 30-sec calibration before using the app.