The CoronaMelder app was downloaded 700,000 times on Saturday, the Ministry of Health reports.

In total, 2.2 million people have now downloaded the app.

The smartphone app can be used throughout the Netherlands since Saturday.

The app warns if users may have been in contact with someone infected by the corona virus.

The app had been in the Google and Apple app stores since mid-August, but was only used in a limited number of test regions.

The app was formally introduced on Saturday at 3 p.m., but GGDs throughout the Netherlands started using it from the start of the day.

The application uses the bluetooth signal to see which other app users someone has been close to.

Signal strength is used to see approximately how close someone got.

If someone is infected with the corona virus, the GGD will ask whether this person wants to let all passers-by know in the past period.

These people will then receive a warning that they may have come into contact with the corona virus.

Ten days in home quarantine

Recipients of such a message are advised to go into home quarantine for ten days.

A test is only necessary if users also have complaints, as has been advised for some time.

The app works on iPhones with at least iOS 13.5 and Android devices with at least Android 6.0.