Coming to the tricky part we think many other solutions miss. What’s the value for the user to install and use the app? There you go.

We won’t show the risk index value to the user, rather it will determine a simpler color-coded status, visible as a badge as follows:

- Red means the user has been confirmed as infected;

- Orange, high risk of being infected. Needs to be tested and stay precautionary quarantined waiting for a test;

- Yellow, low-medium risk of positivity. The citizen can live a normal life, maybe using DPIs;

- Green, almost no risk of positivity.

We imagine a World in which these badges will be required or highly recommended to take part in social events, to travel, to go to the office.

A few examples: going to a concert would be allowed only by showing a green badge, an employer will let workers into the office only with a yellow or green one. Restaurant owners may want to accept only green badges, to advertise their business as a virus free place.

It might seem a bit crazy, but psychological studies (and your weekly tour at the supermarket) already show the decreasing trust in hygiene of products and people. This system has a strong effect on that and gives a strong reason for the citizens to use the app: to live a normal life, having a fully functioning badge will be crucial.

The app can also assist people on what to do when their status changes (e.g self isolation for n-days), it can be used by medical operators to establish a one-to-one channel with people that require attention.