Tens of thousands of people have already registered for the HSE's Covid Tracker app.
The technology will be launched by officials from the Government, HSE and Department of Health this morning.
Upon installing the app, people will be asked to provide their phone number to HSE contact tracing teams.
It will send notifications to those who have been in close contact with someone who has tested positive for Covid-19.
Close contact is believed to be about 15 minutes, and it uses what's called a "bluetooth hand shake" to speak to other devices.
That means no personal information is given out and no one will know the identity of the person who tests positive.
Features also include a symptom check where you can describe your condition.
But Liam Herrick from the Irish Council for Civil Liberties says he can't recommend installing it at this point;
"We still don't see the case being made that the benefits will outweigh the potential risks but there's still an opportunity for more transparency and have a good statutory oversight mechanism."
The app also has a page of advice for people who are sent a notification and are informed that they are a close contact of a positive case.
