The app works with key codes distributed by Ontario public health officials, government officials said.
Those in other provinces can still download the app and will still be notified if they have been near someone who entered a key code, government officials told reporters.
If someone downloads the app at the time of receiving a positive COVID-19 test result, app users who had been in their vicinity will still be notified when the ill person “uploads” the key code.
Because the positive test result is reported to the app by the user, rather than public health officials, the government characterized the app 's use as voluntary.
Government officials also declined to call the app “contact tracing,” since it does not collect personal contact information or trace locations.