Care19 Contact Tracing Apps

Care19 Alert

Governor Mark Gordon in partnership with developer ProudCrowd has made available a free mobile app to help reduce the spread of COVID-19. The app, Care19 Alert, is available now for mobile phones and already is in use in North Dakota.


Care19 Alert is the official COVID-19 exposure notification app for North Dakota and Wyoming as authorized by each states Department of Health.


Care19 Alert allows you to receive notifications if you have been near someone who has tested positive for Covid-19 recently. Care19 Alert uses Apple’s Exposure Notification API to help reduce the spread of the coronavirus, with user privacy and security central to its design.


Care19 Alert maintains your privacy while securely communicating with nearby iOS and Android devices that also have exposure notifications enabled. This happens through the exchange of random keys that change every 15 minutes. These keys are stored securely on your device and hidden from the Care19 Alert application. All keys remain on your device and are not accessible unless you have tested positive for COVID-19, been contacted and verified by the Department of Health, and consent to sharing the random keys with others.


Care19 Alert allows you to notify others if you test positive for COVID-19 and it will notify you if someone you came in contact tested positive for COVID-19. With your permission, your key/date pairs will be securely uploaded to the National Key Server run by the Association of Public Health Laboratories. All uploaded key/date pairs are distributed to all of the devices connected to the National Key Server.


The downloaded keys are matched by the operating system based on criteria established by each Department of Health, and if you have a match you will be notified of the exposure and provided by your department of Health with the set of actions to take provided.


Care19 Alert is now available in the Apple App store and the Android Play Store.


How This Technology Works

Public health authorities around the world are building apps that use the Exposure Notifications System to help their contact tracing efforts. You can find the app for your area (if available) in your app store.

Once you opt-in to the notification system, the Exposure Notifications System will generate a random ID for your device. To help ensure these random IDs can’t be used to identify you or your location, they change every 10-20 minutes.

Your phone and the phones around you will work in the background to exchange these privacy-preserving random IDs via Bluetooth. You do not need to have the app open for this process to take place.

Your phone periodically checks all the random IDs associated with positive COVID-19 cases against its own list.

If there’s a match, the app will notify you with further instructions from your public health authority on how to keep you and the people around you safe.

Exposure Notifications and your privacy

We understand how important your privacy is. Here’s how we’ve built this system to respect your privacy and keep you in control.

You control whether you receive Exposure Notifications

This technology only works if you decide to opt-in. If you change your mind, you can turn it off at any time.


The Exposure Notifications System doesn’t track your location

The Exposure Notifications System does not collect or use the location from your device. It uses Bluetooth, which can be used to detect if two devices are near each other — without revealing where the devices are.


Neither Google, Apple, nor other users can see your identity

All of the Exposure Notification matching happens on your device. The system does not share your identity with other users, Apple, or Google. Public health authorities may ask you for additional information, such as a phone number, to contact you with additional guidance.


Only public health authorities can use this system

Access to the technology will be granted only to apps from public health authorities. Their apps must meet specific criteria around privacy, security, and data use.


Care19 Diary

Governor Mark Gordon in partnership with developer ProudCrowd has made available a free mobile app to help reduce the spread of COVID-19. The app, Care19 Diary, is available now for mobile phones and already is in use in North Dakota and South Dakota.


Once the app is downloaded, users are assigned a random ID number and the app will create a diary of where an individual has visited throughout the day. The ID number of each individual contains no personal information besides location data. Individuals are then encouraged to review the diary to ensure the tracking of locations is correct, adding visits that may have been missed, or deleting others that may have been suggested in error. The app will only suggest locations of places a person visits for 10 minutes or more. A user can clear their history at any point as well.


If you test positive for COVID-19 in the future, you can use the phone diary to help contact tracers protect others that may have been in contact with you. Another option for a user is to consent to share the information about locations you’ve visited with the WDH to support the critical contact tracing process, but your privacy is protected.


“In implementing this app Wyoming joins North and South Dakota as a leader in the response to COVID-19,” Governor Gordon said. “Governors Noem and Burgum have already implemented this entirely voluntary program. Here in Wyoming, the more citizens who choose to voluntarily participate, the more effective our fight against COVID-19 will be. The information this app gathers can save lives. Embracing this technology is one more way we can show that we’re all in this together.”


WDH and county health officials have worked tirelessly to track COVID-19 cases in the state and limit the virus’ spread through contact tracing efforts. The Care19 Diary app will help enhance the extensive contact tracing already occurring in the state.


“We are extremely excited that our work for North Dakota and South Dakota is now being used to also help the people of Wyoming” said ProwdCrowd CEO Tim Brookins. “Big thanks to Governor Gordon and his team for their partnership. We built these products with privacy as our primary design point – wide-scale adoption is the ultimate goal!”


Care19 Diary is now available in the Apple App store and the Android Play Store.