Take a look NOVID [0] the app CMU professor and graduate students built.
It uses ultrasound to be accurate within 1m.
It also approaches the utility of contact tracing in a completely different way.
This reversal of incentives is critical.
On top of that, NOVID also actually demonstrates the necessary accuracy to function. It is the only app which dares to report estimated distances to every user on their screen.
We are trying as hard as we can to let people know about these two major points of differentiation from the rest of the contact tracing app space. Thank you for helping!
Also this thread is filled with people complaining about bluetooth spying capabilities and now you post an app with bluetooth always on AND microphone always listening?