Built by teams from:

Together we will help

Doctors and researchers at the University of Washington with Microsoft volunteers have built a tool to alert you about highly relevant public health announcements, potential exposure to COVID-19, and to assist public health officials and contact tracing teams without compromising your personal privacy. Your data always stays on your phone, unless you decide to share it.

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Download iOS demo app

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*The current version of the application is for demonstration purposes only. We welcome your feedback before going live.

News: Washington state and Apple/Google are working with our team

Feature overview on Android and iOS

Exposure notifications with Bluetooth

Broadcasting announcements with Google Forms

About CovidSafe

Control your data

Get alerted when you've been potentially exposed to COVID-19, while remaining anonymous.

Helping healthcare workers

Help public health agencies to track the spread of COVID-19 and manage the spread of the virus.

Protect your community

Contribute to reducing the spread of COVID-19 and save lives within your community.

Download User Journey Slides

Our team combines talents from all disciplines to keep you safe

We are a group of public health officials, doctors, researchers and engineers based out of the University of Washington and Microsoft who are working together to keep the public safe and to help public health systems in managing the outbreak.

Privacy Researchers
Machine Learning Researchers
Mobile Systems Researchers
Public Health Officers
Backend Developers
Frontend Developers
UI/UX Designers
Product Managers
Content Writers
Privacy Researchers
Machine Learning Researchers
Mobile-System Researchers
Public Health Officer
Back-End Developers
Front-End Developers
UI/UX Designers
Product Managers
Content Writers

Key Features

Live Notifications

Get alerted when you may have been exposed to COVID-19. Receive information for how to manage symptoms and get tested.

Privacy-Sensitive Tracing

Trace potential exposures to COVID-19 while maintaining complete anonymity. Your privacy comes first.

Narrowcasting for Public Health Officials

Send targeted public service announcements to different neighborhoods in your region.

Symptom Tracker

Track your symptoms over time, store the data on device in a format readily available to share (if necessary) with health officials and contact tracers.


PACT: Privacy Sensitive Protocols and Mechanisms for Mobile Contact Tracing
Justin Chan, Dean Foster, Shyam Gollakota, Eric Horvitz, Joseph Jaeger, Sham Kakade, Tadayoshi Kohno, John Langford, Jonathan Larson, Puneet Sharma, Sudheesh Singanamalla, Jacob Sunshine, Stefano Tessaro

The global health threat from COVID-19 has been controlled in a number of instances by large-scale testing and contact tracing efforts. We created this document to suggest three functionalities on how we might best harness computing technologies to supporting the goals of public health organizations in minimizing morbidity and mortality associated with the spread of COVID-19, while protecting the civil liberties of individuals. In particular, this work advocates for a third-party free approach to assisted mobile contact tracing, because such an approach mitigates the security and privacy risks of requiring a trusted third party. We also explicitly consider the inferential risks involved in any contract tracing system, where any alert to a user could itself give rise to de-anonymizing information.


What is the purpose of this app?
CovidSafe is an app that seeks to reduce the spread of coronavirus in the community, specifically by helping people learn if they've been exposed, connecting them to the appropriate public health guidance, and by enabling effective contact tracing. CovidSafe also reduces the burden on public health systems by offering people who have been positively diagnosed and their potential exposures, a safe, private, and fast way to communicate this information to the people who need it — public health authorities and their contact tracing teams.
How does this app benefit me?
CovidSafe offers several features to protect both you and your community:

  • Get notified about possible exposure. You may be notified if someone who was near you within the last two weeks has come down with symptoms of COVID-19. The measure of ‘near’ is not as precise as the medical definition (within 6 feet for more than 10 minutes), but it is accurate up to a few meters.
  • Track your symptoms. The symptoms you track may be useful to assist public health teams if you are confirmed positive, and for having this information readily available if you are exposed and called for a contact tracing interview. You can also get reliable, vetted information about SARS-CoV-2, why it's so dangerous, and how it spreads.
Who can use CovidSafe?
When it becomes available for use, CovidSafe is free, and anyone can use it.
Who else benefits from my participation with this app?
CovidSafe is capable of alerting people who have been in areas where coronavirus is active. If you test positive for coronavirus, you'll also be able to anonymously notify others you may have been in contact with over the past two weeks to alert them that they may have been exposed, and to prepare them for potential contact tracing interviews.
How does CovidSafe help public health officials?
Traditional contact tracing interviews done by public health services are important, laborious, complicated and can sometimes omit important contacts because patients forget to mention them. CovidSafe helps people who have tested positive remember locations they’ve visited recently, by providing an objective log, which they can then share with contact tracing teams. There is also functionality to organize the contact information of known contacts, which streamlines the interview process and enables contact tracers to work faster.
If I test positive and I disclose it via CovidSafe, what information is revealed to others?
Other people with the application, who have been exposed may be notified, along with the time the exposure occurred. No other information will be revealed.
If I test negative, can a malicious person get access to my phone’s broadcasts and report me as being positive?
No, this isn’t possible. The app is encrypted to prevent it from happening using similar security technology used for other purposes, such as online banking.
If someone else obtains data used to alert people who have been exposed, what can they learn?
They'll see a sequence of random identifiers that have been broadcast over time near people who have tested positive for coronavirus. They could assume the location of the person who tested positive if the random identifiers were collected at specific locations. Otherwise, the person remains anonymous. The security of the system relies on the fact this data can be made public without compromising privacy.
If I receive a message that I have been exposed, what is disclosed to the public?
Nothing about your identity will be disclosed to the public.
Can the identity of a person who chooses to report they’ve tested positive be guessed by others?
Possibly. A person who was near someone who has tested positive may be able to guess the infected person's identity. If there are two or more people who were near someone who has tested positive, the process of identifying the infected person may be easier. However, the person's identity will never be broadcast directly. People’s identities aren’t stored in the data. Only the infected person’s random broadcast is stored.
What data is stored on my phone? What data about me is stored publicly?
Each phone broadcasts a random signal (using Bluetooth) to other nearby phones. All phones remember the signals they send and receive for two weeks. These broadcast signals can be thought of as non-identifying random numbers. The signal each phone broadcasts changes, so the signals remain anonymous and can’t be linked to a specific person. If someone tests positive and chooses to disclose this information to help others, they would be disclosing only their phone's broadcasts for the past two weeks. This lets other people using CovidSafe check if they were near the infected person to determine if they were exposed, based on their own phones' broadcasts.
How does location tracking work?
See the Bluetooth section in the PACT white paper.
Will this information be shared with government agencies?
The tool won't alert government agencies about your identity if you're exposed.
Why should I report my illness?
If you become ill, you can use the app to improve the efficiency and completeness of manual contact tracing interviews. Your privacy is maximized by ensuring that all the data remains on your device, except for what you voluntarily reveal to healthcare authorities to enable more effective contact tracing.