Calling it an important step toward containing the coronavirus and safely restarting the economy, Prime Minister Justin Trudeau’s announced a Canadian-made mobile app to tell Canadians if they’ve been exposed to someone infected is ready for testing in Ontario.

Developed by BlackBerry, Shopify and the Ontario government, Trudeau says the app will be ”strictly voluntary” but will be most effective when as many Canadians as possible have it.

”If you test positive for COVID-19, a healthcare professional will help you upload your status anonymously to a national network,” the prime minister explained.

”Other users who have the app and have been in proximity to you will then be alerted that they’ve been exposed to someone who’s tested positive,” he added.

The notification will encourage them to contact their local public health authorities.

Trudeau says the privacy of Canadians will be respected.

”At no time will personal information be collected or shared and location services will be used.”

The app will be ready for downloading early next month.