An application called "Health Code Demo" was found in Google App Market. The software can not only change the identity information and display the city area at will according to the user's needs, but also switch the color of the QR code by itself. At present, 1000 has been downloaded more than once.
The influence of health code color: first, the spatial dimension. According to the national epidemic risk, big data companies in Hangzhou can accurately go to the town (street) according to relevant data; The second is the time dimension, that is, the number of times someone has been to an epidemic area and the length of stay; Third, the interpersonal dimension, that is, the contact state with close contacts, and then quantify the score.