155K reviews
Content rating
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About this app

The Robert Koch Institute (RKI) – in its capacity as the central federal institution for public health and as the German national public health institute – publishes the Corona-Warn-App on behalf of the German government. The app serves as a digital complement to distancing, hygiene and wearing masks. Additionally, it provides a functionality to add your digital vaccination certificates to prove your vaccination status. It uses Bluetooth technology and the Google Exposure Notification APIs. The app is designed to help break infection chains by informing you if you were recently close to someone who subsequently tested positive for corona. However, at no time does it collect any personal information. Who you are and where you are remain secret – and your privacy is well-protected.


Exposure logging is the core of the app and should always be active. When enabled, smartphones exchange encrypted random IDs with other devices using Bluetooth.

The random IDs only provide information about the duration and distance of an encounter. No one is able to identify the person behind these IDs. The Corona-Warn-App does not collect any information about the location of the encounter or that of its users.

Based on maximum corona incubation times, the random IDs your smartphone collects are stored in an exposure log for 14 days and then deleted. If a person is diagnosed with corona and chooses to share his/her own smartphone’s random IDs, all persons previously encountered will then be notified anonymously.

No one will know when, where or with whom the exposure event took place. The infected person remains anonymous.

In addition to the exposure notifications, affected users will receive clear recommendations for action. Important: Information about the notified persons is not accessible at any time.


The Corona-Warn-App is designed to be your daily companion, without knowing your identity. This is why the app cannot tell anyone who you are. Data protection is fully guaranteed throughout the app’s entire service life.

- No registration required: No email address and no name need to be submitted.

- No personal information is transmitted: When you encounter another person using the app, your smartphones only exchange random IDs. They measure the time and distance of an encounter, but do not allow to identify persons or find out locations.

- Decentralized storage: Data is stored only on the smartphone itself and deleted after 14 days.

- No third-party access: Neither the person reporting a proven corona infection, nor those who have been notified can be traced – not by the German government, the Robert Koch Institute, any other user, nor by Google.

This app is not intended for any use outside of Germany. Corona-Warn-App is the main corona app for Germany, where it is interconnected with the national health care system. Despite of the above, Corona-Warn-App is also available in this country. It is provided for anyone living, working, vacationing, or visiting Germany regularly or for an extended period of time.

The terms of use for the Corona-Warn-App apply: By installing and using this app, you accept these terms of use.
Updated on
Jan 13, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Health and fitness
This app may collect these data types
Location, Personal info and 3 others
Data is encrypted in transit
You can request that data be deleted
155K reviews
Matthew King
November 7, 2022
I have 2 mobiles and accidentally read test results into the wrong one and accepted the certificate. Absolutely no option to transfer this to the correct device. This is a major drawback as now the app doesn't know or communicate the positive results to anyone. This needs to be addressed immediately!
5 people found this review helpful
Sue Jen
October 29, 2022
It's a mix, because as an app it is a GREAT idea, worked really well at the start of the pandemic especially, and I love how it functions. Unfortunately, it uses a lot of battery on my phone, and (as I work in a hospital) I get many red warnings through hospital walls. This is not 'bad', I just wish I could 'pause' it, especially at my work office, and when I sleep.
Manuel Eisenschink
June 29, 2020
Works great, but... It really should expose some information about what it does. You can't really be sure if it really works and knowing that my device had Bluetooth issues now and then, it would be better to see its working by some statistics or a simple counter (tokens collected). Plus side is that it really doesn't affect battery at all. No difference to before installation.
115 people found this review helpful

What's new

This update includes bug fixes and provides the following new functions:

You can now send a warning to other app users if your self test result is positive.
If you have tested positive at a test center after taking a rapid test or PCR test that wasn’t registered in the app, you can now warn others about your test results.
In the coming weeks, the TAN hotline will be removed. You can now warn other users of the app without the need for a TAN.