coronavirus contract-tracing app didn’t roll out on schedule earlier this month because the government wanted to take the time to make the smartphone app user-friendly.“We know from user science, user behaviour that when people download an app that doesn’t work, they often abandon the app,” Health Minister Patty Hajdu said in a news conference on Friday.“The success to this app is actually a large portion of Canadians using it, and so it was worth the time and extra energy to make sure that the app was tested and thoroughly debugged to make sure that it would be a pleasant user experience.” National contact tracing app begins beta testing after delay The voluntary app, when launched and downloaded, will warn users when they’ve been in.