CA Notify, the Silicon Valley-originated exposure notification app, launched in December with all the trappings of success. An Oxford-backed study concluded that if just 15 percent of the state signed ...

Launched over a year ago as a high-tech answer to California’s contact tracing woes, most people who test positive for COVID-19 still are not using the “exposure notifications” smartphone app to warn ...

Late last year, California asked its residents to do a remarkably altruistic thing: Tell a state-sponsored cell phone app if they’d tested positive for COVID-19, as a public service to save lives. The ...

SAN FRANCISCO (KGO) -- Statewide, alerts have been sent to many smartphones letting people know if they have been exposed to someone with COVID-19. The alert system has been around for more than a ...