Blog
All important information about the development of the Corona-Warn-App. Further information can be found in the frequently asked questions about the Corona-Warn-App.
Certificates: Vaccination certificate, Extension, Export (single), Export (all), Assignment, Booking tickets, Recall, Booster notification, Booster vaccination, Recovery certificates, Family members
Other topics
Risk assessment: Time & place, Omicron variant, Red tile, Virus variants, ENF 2 (1), ENF 2 (2), Several exposure checks per day, Risk calculation adjusted (1), Risk calculation adjusted (2), Risk calculation adjusted (3)
iOS- and Android devices: iOS 13.7 Problems, iOS 13.7 Fix, iOS 12.5 (iPhone 5s, 6 or 6 Plus) Announcement, iOS 12.5 (iPhone 5s, 6 or 6 Plus) Implementation
Contact journal: People / Locations / Export, Location / Duration / Circumstances, Error reports, Exposure history, Risk encounters, Test result
Testing: Profile, Family feature, Recycle bin, Test certificates, Rapid test partner search, Rapid test profile, Event registration, Rapid tests, Self-tests
Statistics: Pandemic Radar, Pandemic Radar (until version 2.28), Booster vaccinations, COVID-19 patients / Local & Nationwide 7-day incidence (hospitalization), Local 7-day incidence, Vaccinated once / Vaccine doses / Basic immunization, Confirmed new infections / Warnings by app users / 7-day R-value / Nationwide 7-day-incidence
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Version 3.0: CWA warnings now possible after positive self-test
The project team of the Robert Koch Institute (RKI), Deutsche Telekom, and SAP have released version 3.0 of the Corona-Warn-App (CWA). With this update, users of the app can now warn others after a positive self-test. Calling the verification hotline to issue teleTANs after a positive test result that was not transmitted to the CWA is no longer necessary. Therefore, the operation of the verification hotline will be discontinued as of 31.01.2023.
Version 2.28: Corona-Warn-App with tile leading to the RKI’s pandemic radar
The project team of the Robert Koch Institute (RKI), Deutsche Telekom, and SAP have released version 2.28 of the Corona-Warn-App (CWA). With the update, the team has added the tile “Pandemic Radar” to the statistics area. In addition, a short text in the detail view on the vaccination status now provides more information about the vaccination status for children under the age of 12 in accordance with the current German infection protection law.
Version 2.27: Project team adapts CWA to new Infection Protection Act
The project team of the Robert Koch Institute (RKI), Deutsche Telekom, and SAP have released version 2.27 of the Corona-Warn-App (CWA). With this update, the team is adapting the CWA to the new German Infection Protection Act (German only), which applies from October 01, 2022. This affects the display of the proof of status and the information on the users' vaccination status. In addition, the project team has prepared the CWA to display mandatory mask-wearing in the app and enables the export of single certificates that were not issued in Germany.
Project team releases CWA version 2.26 with improvements
The project team of the Robert Koch Institute (RKI), Deutsche Telekom, and SAP have released version 2.26 of the Corona-Warn-App (CWA). In the new version, the team has made improvements and adjustments, as well as fixed minor bugs.
Version 2.26, like previous versions, will be rolled out to all users in stages over 48 hours. iOS users can now download the latest app version manually from the Apple Store. The Google Play Store does not offer the option of triggering a manual update. The new version of the Corona-Warn-App will be available to users here within the next 48 hours.
Up-to-date information on the status of the roll-out and the CWA in general can be found on the Twitter channel of #coronawarnapp (German only).
CWA 2.25: Updated guidelines in case of a low or increased risk
The project team of the Robert Koch Institute (RKI), Deutsche Telekom, and SAP have released version 2.25 of the Corona-Warn-App (CWA). The team has updated the guidelines on what to do in case of a low or increased risk (red as well as green tile) corresponding to the recommendations of the RKI (German only). Among other things, this involves recommendations on contact restriction and wearing masks. In addition, the project team has made improvements and small adjustments.
Given the current pandemic situation, it is still useful and important to use the CWA and its functions, especially to warn others.
CWA 2.24: All certificates in one PDF document
The project team of the Robert Koch Institute (RKI), Deutsche Telekom, and SAP have released version 2.24 of the Corona-Warn-App (CWA). With the update, users can save all certificates available in their app in one PDF document in only one step.
CWA 2.23: Extension of technically expired certificates in the CWA
The project team of the Robert Koch Institute (RKI), Deutsche Telekom, and SAP have released version 2.23 of the Corona-Warn-App (CWA). With the update, users can renew technically expired certificates via the CWA.
CWA 2.22: Rapid test profiles for family members
The project team of the Robert Koch Institute (RKI), Deutsche Telekom, and SAP have released version 2.22 of the Corona-Warn-App (CWA). With the update, users can create rapid test profiles for family members.
Corona-Warn-App Version 2.21 enables test administration for family members
The project team of the Robert Koch Institute (RKI), Deutsche Telekom, and SAP have released version 2.21 of the Corona-Warn-App (CWA). The update allows users to register tests for family members. In addition, the project team has adjusted the texts about the user’s vaccination status in the certificate area.
CWA 2.20: Corona-Warn-App Available in Ukrainian Language
The project team of the Robert Koch Institute (RKI), Deutsche Telekom, and SAP have released version 2.20 of the Corona-Warn-App (CWA). With the update, the project team translated the CWA into Ukrainian, shortened the increased risk display (red tile), and improved notifications for risk encounters and G-status changes. Besides, they adjusted the risk display after a positive test result. Also, recovery certificates won’t display validity dates anymore since the validity of the certificates depends on local rules. In addition, since March 29, 2022, users will be able to request vaccination certificates to be reissued directly via the app.
CWA 2.19 improves the assignment of certificates to persons
The project team of the Robert Koch Institute, Deutsche Telekom, and SAP have released version 2.19 of the Corona-Warn-App (CWA). The update enables a more error-tolerant assignment of certificates to persons. This means, for example, that minor differences in first and last names are ignored and name additions such as academic titles are filtered out so that certificates are still assigned to the same person.
CWA 2.18: Improving the display of the G status in the Corona-Warn-App
The project team consisting of the Robert Koch Institute, Deutsche Telekom and SAP has released version 2.18 of the Corona-Warn-App (CWA). Version 2.18 now allows the dynamic mapping of rules, each of which must be specified and stored by the federal government and the states. The CWA then automatically maintains these rules. These rules can always be found on the corresponding websites of the federal government and the federal states. In the new release, among other things, the 2G+ status is now displayed for persons with booster vaccination.
Booster vaccination statistics, date of deletion in recycle bin, and link to social media channels
Project team publishes CWA version 2.17
The project team of the Robert Koch Institute, Deutsche Telekom, and SAP have released version 2.17 of the Corona-Warn-App (CWA). With the update, users can now see the number of people in Germany who have received a booster vaccination in the statistics. In addition, the project team has revised the notes and procedure for a positive test result and added a link to the CWA’s social media channels. Furthermore, the recycle bin now displays the deletion date for each item.
Why doesn't the Corona-Warn-App show the exact time and place for a red risk tile encounter?
This blog article is available as Warum zeigt die Corona-Warn-App bei einer roten Kachel die genaue Uhrzeit und den Ort der Begegnung nicht an? in a German version only.
Corona-Warn-App version 2.16 shows users’ current status evidence
Updated on January 17, 2022 at 12 pm
The project team of Robert Koch Institute, Deutsche Telekom, and SAP have released version 2.16 of the Corona-Warn-App (CWA). With the update, the CWA now shows users their current status verification in the certificate area. If users have a valid vaccination or recovery certificate and a test certificate stored in the app, these are shown in a combined display in the certificate overview.
Will the CWA be modified for the Omicron variant?
German version updated on 21 January 2022
This blog article is available as Wird die CWA an die Omikron-Variante angepasst? in a German version only.
Corona-Warn-App simplifies certificate checks when booking tickets
Updated on January 10, 2022 at 1:30 pm
The project team of Robert Koch Institute, Deutsche Telekom and SAP have released version 2.15 of the Corona-Warn-App (CWA). The update enables the CWA to support online verification services in the future. Online verification services are intended to provide users with a data-saving way to prove that they have been vaccinated, recovered or tested negative while booking services such as tickets.
Important update from January 10, 2022: The Europe-wide requirements for online verification services have already been in place since October 2021. In Germany, no provider of an online verification service has been approved yet. Tests are currently being carried out, the results of which are being awaited for the time being. Online verification services will not be available in practice until these tests have been evaluated and the Federal Commissioner for Data Protection and Freedom of Information (BfDI) has provided advice. With version 2.15, however, the CWA is ready to support corresponding verification services as soon as providers of such a service are approved.
The actual online verification service is external to the CWA and does not affect its operation. The use of online verification services from within the CWA is voluntary and does not affect the users' data security. At the same time, however, the current situation regarding bookings and the use of automatic access systems will be made much more data-efficient.
What should you do if you see a red tile?
In Germany, the number of COVID-19 infections is still very high. From December 1 to December 7 alone, an estimated 1.1 million users received a “red tile” in the Corona-Warn-App (CWA; as of December 14, 2021)*. However, many of these users have already been vaccinated or have recovered from a COVID-19 infection. So, what should you do if you see a red tile? And how and when does it disappear again?
Corona-Warn-App version 2.14 introduces recycle bin feature for PCR and rapid tests
The project team of the Robert Koch Institute, Deutsche Telekom, and SAP have released version 2.14 of the Corona-Warn-App. With the update, users can now restore deleted PCR and rapid tests.
Corona-Warn-App informs users about recalled vaccination certificates
To help inform users about misuse and counterfeiting of vaccination certificates, the project team of the Robert Koch Institute, Deutsche Telekom, and SAP have released an enhancement to the Corona-Warn-App version 2.13. The hotfix allows digital vaccination certificates from certain pharmacies to be recalled and marked as invalid in the app.
Check-In feature: Corona-Warn-App can now scan luca's QR codes
Corona-Warn-App users can now check-in to events and at venues whose organizers or owners use the luca system and provide luca's QR codes. This means that organizers or owners no longer have to present two different QR codes.
Which app can scan which QR codes? What happens to my data? What are the differences between the Corona-Warn-App and the luca app? Users can find the most important questions and answers in the FAQ section
Corona-Warn-App notifies users about a booster vaccination
The Corona-Warn-App will soon notify the first users for whom the Standing Committee on Vaccination (STIKO) recommends a booster vaccination. This initially includes two groups of people.
First, all persons who are at least 70 years old and who have not been diagnosed with COVID-19 will be informed if their basic immunization has happened more than six months ago. Second, the app informs users who were vaccinated with Johnson & Johnson's vaccine more than four weeks ago and who have not been diagnosed with COVID-19 so that they can optimize their basic immunization.
Oops, certificate deleted? - Corona-Warn-App version 2.13 gets it back!
The project team of the Robert Koch Institute, Deutsche Telekom, and SAP have released version 2.13 of the Corona-Warn-App. With the update, they have added a recycle bin functionality for certificates. In addition, the 7-day hospitalization incidence is available at the local level and the project team improved the assignment of certificates to people.
The update is available to users over the next 48 hours.
Corona-Warn-App version 2.12 enables central access to QR code scanner and expands statistics area
The project team of the Robert Koch Institute, Deutsche Telekom and SAP have released version 2.12 of the Corona-Warn-App. Users now have direct access to the universal QR code scanner. In addition, the 7-day hospitalization incidence and the number of COVID-19 patients in intensive care units are now available in the statistics.
The update will be available to users over the next 48 hours.
Why the Corona-Warn-App is important right now
A guide to the app's main functions
Attending an open-air concert, going to a restaurant, beer garden or theatre – vaccinated, recovered and tested people can do all these things again. It was the spring and summer months that made it possible. The months in which the 7-day incidence was reasonable and events took place outside.
But what about the fall when life shifts from outdoors to indoors again? The Corona-Warn-App can help ensure that we can continue to eat a pizza at our favorite Italian restaurant, go shopping or visit an exhibition - even indoors.
Corona-Warn-App version 2.11 simplifies QR code scanning
The project team of the Robert Koch Institute, Deutsche Telekom, and SAP have released Corona-Warn-App version 2.11, which contains a universal QR code scanner. Android users also have the option of importing QR codes from photos or PDF files using the QR code scanner. iOS users will be able to use this feature as of version 2.12.
The update will be available to users within the next 48 hours.
Key figures dashboard for the Corona-Warn-App
An overview of important key figures for the Corona-Warn-App is now available in the form of a digital dashboard. The key figures in the dashboard are updated daily. In the launch version, the following key figures are available: Downloads, test registration, test results, sharing behavior, and low-risk and high-risk alerts. The metrics in the dashboard are updated daily. They can be accessed under the "Dashboard" tab and downloaded as a csv file.
Current facts and figures about the Corona-Warn-App
In this post, you will find facts and figures on the development of the Corona-Warn-App, as well as on the number of transmitted and shared test results up to September 30, 2021.
You can now find the most important key figures under "Dashboard" in an interactive dashboard that is updated daily. For more information on the dashboard, visit the blog: Key Figures Dashboard for the Corona-Warn-App.
Overview of previous facts and figures
(German versions only)
Version 2.10: Corona-Warn-App ready to inform users about booster vaccinations
Project team continues to adapt the Corona-Warn-App to current pandemic events
Deutsche Telekom and SAP’s project team have released version 2.10 of the Corona-Warn-App. With the update, the app is ready to inform users about any upcoming booster vaccinations. It also shows users a printable version of their vaccination certificates. This allows them to save the certificates as a PDF document or print them out.
The update will be available to users over the next 48 hours.
Corona-Warn-App version 2.9: Organizers can use the check-in function to warn guests on behalf of the health department
Deutsche Telekom and SAP’s project team have published version 2.9 of the Corona-Warn-App. The update enables event organizers to warn guests in place of a person who has tested positive later. In addition, the Corona-Warn-App now displays full vaccination status after the first vaccination for users who have recovered from a COVID infection. Users who have received a booster vaccination can now also transfer the digital certificate into the Corona-Warn-App.
The update will be available to users over the next 48 hours.
Corona-Warn-App version 2.8 displays names in certificates in standardized characters
Deutsche Telekom and SAP’s project team have published version 2.8 of the Corona-Warn-App. The new update brings minor improvements and adjustments for users. Each certificate now displays the user’s name in standardized Latin characters. The project team has also adapted the EU certificate check.
The update will be available to users over the next 48 hours.
Corona-Warn-App Version 2.7 shows technical expiration date and automatically checks certificates for authenticity
Deutsche Telekom and SAP’s project team have released Corona-Warn-App version 2.7. The app now checks the certificates’ signatures for authenticity. It also displays the certificates’ technical expiration dates and notifies users before their expiration.
The new version will become available to users over the next 48 hours.
Explanation of the statistic tiles in the Corona-Warn-App
Using the statistic tiles, you are now able to get a quick overview of the confirmed new infections, the warnings by app users, the 7-Day Incidence and the 7-Day R Value. In this blog post, these numbers are explained in more detail.
Users can add local 7-day incidences and check certificates for validity before traveling
Project team releases version 2.6 of the Corona-Warn-App
Deutsche Telekom and SAP’s project team have released version 2.6 of the Corona-Warn-App. Users can add local 7-day incidences and use the EU certificate check to find out if their certificates are valid before traveling. In addition users can edit a rapid test profile that has already been created.The new version will be available to users within the next 48 hours.
Corona-Warn-App version 2.5: Users can integrate recovery certificates and certificates for family members
Deutsche Telekom and SAP’s project team have released version 2.5 of the Corona-Warn-App, in which users who have recovered from COVID-19 can integrate a digital certificate that serves as official proof for their recovery. Whether vaccinated, recovered, or tested, users can now manage all types of certificates in one place in their Corona-Warn-App. Users can manage certificates both for themselves and for others, such as children.
In addition, the section with statistics now contains key figures on the vaccination status in Germany.
Virus variants in the Corona-Warn-App
With regard to the newly emerging "variants of concern" (VoC), in particular the delta variant in Germany, the Project Team of the Corona-Warn-App is continuously monitoring possible adaptions of the performance of the app to the current circumstances. In this context, discussions on adapting the risk calculation continue to take place between the project participants from the Robert Koch Institute, the Deutsche Telekom, SAP and the Fraunhofer Institute for Integrated Circuits IIS.
Digital vaccination certificate now in the Corona-Warn-App's certificates section
With the update to version 2.4 of the Corona-Warn-App, the project team introduced a "Certificates" section that users can find in the tab bar at the bottom of their app. By selecting the section, they can now see all their digital certificates and add new ones, including the digital vaccination certificate and test certificates. All certificates, including those previously found on the main screen when opening the Corona-Warn-App, are now located in this central area.
In the future, the certificate area will be expanded to serve users as a central management location for all official COVID digital certificates.
Corona-Warn-App has its own Twitter channel
Anyone who wants to find out more about the Corona-Warn-App and get quick details can now do so on Twitter. The project partners Robert Koch Institute, SAP and Deutsche Telekom have set up a channel for the CWA.
Project team releases rapid test partner search and Corona-Warn-App version 2.4 with digital test certificate
The new feature serves as proof of an official negative test result
Deutsche Telekom and SAP’s project team have released version 2.4 of the Corona-Warn-App, in which users can request a digital test certificate for PCR and rapid tests, which will be issued if the test result is negative. Within the EU, Iceland, Norway, Switzerland, and Liechtenstein they can use the certificate as proof of an official negative test result.
In addition, users can now find test providers who support the submission of test results to the Corona-Warn-App via an online rapid test partner search.
Corona-Warn-App version 2.3 integrates digital vaccination certificates
Deutsche Telekom and SAP’s project team have released Corona-Warn-App version 2.3, in which users can add their SARS-CoV-2 vaccination certificates. After the addition of the check-in function and the possibility to document the infection status with a (negative) rapid test, users can now also prove their personal vaccination status with the help of the Corona-Warn-App.
Corona-Warn-App version 2.2 enables creation of a rapid test profile and error reports
Deutsche Telekom and SAP’s project team have released a new version of the Corona-Warn-App, which will be available to users within the next 48 hours. In version 2.2, users will be able to create a rapid test profile and an error report.
Corona rapid test via app: How to register for dm, EcoCare or testbuchen.de/No-Q tests
This blog article is available as Corona-Schnelltest per App: So funktioniert die Registrierung für dm, EcoCare und testbuchen.de/No-Q in a German version only.
Project team integrates rapid COVID-19 tests into Corona-Warn-App version 2.1
Eight partners participate from the beginning
Deutsche Telekom and SAP’s project team have integrated the announced rapid COVID-19 tests in the Corona-Warn-App’s latest version (2.1) launching today. Users can now break infection chains and warn their fellow citizens even faster. The update will be available to all users within the next 48 hours.
Event registration: Project team releases additional features
The Corona-Warn-App community has developed a QR code generator for the app's website, which is now available at https://coronawarn.app/en/eventregistration/. Event organizers, retailers and private individuals have the opportunity to generate QR codes independently of the Corona-Warn-App. In addition, the project team has published a Node.js-based command-line interface on GitHub, allowing larger organizations to build their own customized solutions.
Project team releases Corona-Warn-App 2.0 with event registration
Deutsche Telekom and SAP’s project team have released version 2.0 of the Corona-Warn-App, which will be available to users within the next 48 hours. The update adds the event registration feature to the app, allowing users to check in via a QR code at retail stores, events or private meetings. Corona-Warn-App 2.0 has benefitted from discussions with Dr. Wouter Lueks and Prof. Carmela Troncoso from EPFL (École polytechnique fédérale de Lausanne) on how to adapt their decentralized, privacy-preserving protocol CrowdNotifier, to support automatic notifications.
Project Team further improves Corona-Warn-App's risk calculation in response to current coronavirus situation
The Corona-Warn-App's project team continuously improves the app's performance with regard to the coronavirus situation in Germany. In response to virus mutations, the team members from the Robert Koch Institute, Deutsche Telekom, SAP and the Fraunhofer Institute for Integrated Circuits (IIS) have therefore further improved the risk calculation and reduced the duration of a critical encounter from 13 minutes to 9 minutes.
Federal Government integrates rapid COVID-19 tests into Corona-Warn-App
Strong partners support the new feature
The federal government's Corona-Warn-App is getting another important feature. In the future, the app will integrate rapid COVID-19 tests. Users can save the confirmation of their test in the app and add them to the contact journal. In addition, anyone who tests positive for COVID-19 through a rapid test will also be able to warn contacts via the Corona-Warn-App in the future.
Corona-Warn-App version 1.15 exchanges keys with the Swiss warning app
A new version of the Corona-Warn-App will be available for users within the next 48 hours. In version 1.15, Deutsche Telekom and SAP’s project team have expanded the transnational exposure logging to include Switzerland, and made changes to the risk card.
Corona-Warn-App's risk calculation further improved
The project team continuously tests the Corona-Warn-App's performance to configure it optimally - especially in respect to the Corona situation in Germany with increasing case numbers and higher infectivity due to the mutated virus variants. In recent weeks, the Fraunhofer Institute for Integrated Circuits (IIS) and the Robert Koch Institute tested and evaluated the app's measurement accuracy (using version 2 of the Google-Apple exposure notification framework).
Corona-Warn-App version 1.14 brings new features to the contact journal
In the Corona-Warn-App’s new version, Deutsche Telekom and SAP’s project team have added more features to the contact journal as well as more data points to the voluntary data donation. Version 1.14 will be available to users within the next 48 hours.
Users can provide data voluntarily to help improve the Corona-Warn-App further
Deutsche Telekom and SAP’s project team have released the Corona-Warn-App’s next update that will be available to users within the next 48 hours. With version 1.13, users now have the option to voluntarily donate data to help improve the app. In addition, the app now includes a link to a scientific survey conducted by the Robert Koch Institute (RKI).
Corona-Warn-App Survey
German only
Mehr als 25,7 Millionen Menschen haben die Corona-Warn-App mittlerweile heruntergeladen. Die Wirksamkeit der App im Kampf gegen die Pandemie ist dabei direkt abhängig von der Bereitschaft der Menschen die App aktiv zu nutzen. Mehr als eine viertel Millionen Nutzer*innen haben ihr positives Testergebnis bisher geteilt und ihre Mitmenschen damit vor einer potentiellen Infektion mit dem Corona-Virus gewarnt. Um die Annahmebereitschaft der App in der Bevölkerung noch weiter zu erhöhen, hat die Bergische Universität Wuppertal eine Umfrage (Die Umfrage wurde inzwischen beendet, daher wurde der Link entfernt) zur Motivation von Nutzer*innen der Corona-Warn-App erstellt.
Corona-Warn-App’s risk calculation further adjusted after detailed tests
Deutsche Telekom and SAP’s project team continue to adapt the Corona-Warn-App’s risk calculation in collaboration with the Robert Koch Institute (RKI) following extensive tests by the Fraunhofer Institute for Integrated Circuits (IIS). As a result, the app can now identify encounters with increased risk even better. and will show even more precisely when users have had encounters with people who later tested positive for COVID-19.
Now, the app considers short contacts between two people that lasted at least 5 minutes, not 10 minutes as it was the case before. The relevant data for this adjustment is only available because Apple and Google developed their interface further. Measurements based on version 2 of the interface confirmed that warnings can be better and more accurate through the adjustment.
Corona-Warn-App version 1.12 comes with two new features
Deutsche Telekom and SAP’s project team has released an update of the Corona-Warn-App, which will be available to users within the next 48 hours. There are two major innovations in version 1.12: First, the Corona-Warn-App now runs on the iPhone 5s, 6, and 6 Plus. Secondly, users can now find their exposure history in the contact journal.
Corona-Warn-App compatible with iOS 12.5 from next week on
The Corona-Warn-App’s next update will be available on February 10, 2021. With version 1.12, the Corona-Warn-App will be compatible with iOS 12.5 so that owners of older iPhones, such as the iPhone 5s, 6, and 6 Plus, can use the app. Deutsche Telekom and SAP’s project team also adds an exposure history to the contact journal.
Corona-Warn-App version 1.11 with statistics is available
Within the next 48 hours, users will be able to download the Corona-Warn-App’s next update. With version 1.11, the Deutsche Telekom and SAP's project team added an additional area with statistics to the app’s home screen. There, users can see current key figures on the infection numbers in Germany, as well as the number of users tested positive who have warned their fellow citizens via the app.
Problem with key matching on Android is fixed
Google has released a fix to solve the key matching issue on Android smartphones. By now, the Corona-Warn-App should be working again on the affected devices. Google assured in a statement that the issue did neither lead to loss of data nor potential exposures:
Corona-Warn-App not able to perform key matching on Android smartphones in some cases
Currently, the Corona-Warn-App is not able to perform key matching on Android smartphones in some cases. This is due to the Exposure Notification Framework under the Google smartphone operating system. The project team has informed Google about the problem and is working together with them under high pressure to solve the issue.
Behind the scenes of the Corona-Warn-App
The Corona-Warn-App is a useful, digital tool that warns users of high-risk encounters during the pandemic. The processes in the background, however, remain more or less invisible to most users. In a livestream for the virtual Chaos Communication Congress (rC3), Thomas Klingbeil, SAP Solution Architect for the Corona-Warn-App, explains how the app works in the backend.
Corona-Warn-App version 1.10 with contact journal is available
Deutsche Telekom and SAP's project team published the next update of the Corona-Warn-App. It will be available for download in the next 48 hours. The most important innovation in version 1.10 of the Corona-Warn-App is a contact journal. Users can use the app to voluntarily note the people they’ve met and places they’ve visited. This is important information for the health department and for tracing infection chains. However, it is difficult to recall that information over a time period of two weeks so the contact journal serves as a useful memory aid.
Corona-Warn-App version 1.10 comes with an integrated contact journal
With the Corona-Warn-App's next update (version 1.10), Deutsche Telekom and SAP's project team add a contact journal to the app, where users can note the names of people they’ve met and locations they’ve visited.
Risk calculation under Exposure Notification Framework Version 2
Previously, the Corona-Warn-App displayed one or more low risk encounters. Since the update, these have disappeared or rather the number decreased, because the risk calculation improved significantly under Version 2 of the Exposure Notification Framework (ENF). With the interface's new version, it is now possible to control more precisely which encounters should be counted.
Corona-Warn-App Version 1.9 to use version 2 of the Exposure Notification Framework
Deutsche Telekom and SAP's project team published a new version of the Corona-Warn-App which will be rolled out to all devices over the next 48 hours. Version 1.9 uses the updated version of the Exposure Notification Framework (ENF) provided by Apple and Google. The two companies have evolved the framework so that more precise pseudonymous information about encounters can be provided.
Telekom and SAP to make Corona-Warn-App available for iOS 12.5
Apple now makes its Exposure Notification Framework available for the iOS 12.5 operating system version as well
Corona-Warn-App Version 1.7 can perform the exposure check several times a day
Corona-Warn-App Version 1.7 is now available in the Google Play Store and Apple’s App Store. With the update, Deutsche Telekom and SAP's project team enabled the exposure check to run several times a day. In addition, users who have tested positive will now receive a reminder if they haven’t shared their test result.
Security update for Corona-Warn-App-Server
Deutsche Telekom and SAP's development team was notified by a GitHub Security Lab employee about a vulnerability in the Corona-Warn-App-Server (CWA-Server, Version 1.5). The team closed this vulnerability with version 1.5.1 of the server four days after it was announced. The current version is 1.6.0.
This quickly implemented removal of the vulnerability clearly shows that the open source and community process works flawlessly and significantly contributes to the security of the operation of the Corona-Warn-App.
Corona-Warn-App Update: Version 1.6 explains change of risk status
Deutsche Telekom and SAP's development team has updated the Corona-Warn-App to version 1.6, which is now available in Apple's App Store and the Google Play Store. Version 1.6 provides more detailed explanations about the change in risk status. A short-term problem with regard to the exposure check has already been resolved with version 1.6.1.
New features: Corona-Warn-App Version 1.5 is now available for download
A new update for the Corona-Warn-App is now available in both the Google Play Store and the Apple App Store. Version 1.5 of the App introduces new features such as symptom detection or support of the European Corona App gateway. In addition, some "bugs" have been fixed and further improvements are delivered.
Note for iOS users: Version 1.5 of the app requires at least iOS version 13.6. So please check if your phone is on iOS 13.6 or higher before you update the app to the new app version 1.5.
A positive summary after 100 days
The developers at SAP and Deutsche Telekom regard the first 100 days since the Corona-Warn-App’s launch as a success. Since its release on June 16, the app has been downloaded more than 18.3 million times. This high number of downloads compared to other European countries shows that the population is giving the app a chance and is willing to use an intelligent technology to fight the spread of the pandemic.
In this document (German only), based on the current data status, you will find further facts and figures about the Corona-Warn-App, the laboratory connection and the test results transmitted.
Problem in connection with iOS 13.7 fixed
In close cooperation with Apple, the developers could fix the problem in Apple’s iOS 13.7 operating system that was identified a few days ago. Affected users should now receive a correctly calculated risk assessment under iOS 13.7 again. The adjustments were made directly on the server. This means that the Corona-Warn-App does not have to be updated and users do not have to do anything.
What requirements must be met in order for a personal test result to be successfully transmitted via the Corona-Warn-App?
In order to ensure that users receive their test results via the Corona-Warn-App, the following points are important:
Problems with iOS 13.7
During the course of regular tests on the Corona-Warn-App, developers today discovered a problem in the Apple operating system iOS 13.7, relating to the determination of the risk values. The iOS version released by Apple on September 1 may lead to confusing risk calculations for a small number of users. In some cases, the app may show some users that they were exposed to a higher risk than was actually the case.
Corona-Warn-App Version 1.3 brings improvements and new features
We have updated the Corona-Warn-App to version 1.3, which is available for download in Apple's App Store and Google Play Store. The latest version includes a number of enhancements, such as improved texts for the risk status and test results as well as clearer messages when scanning QR codes.
QR Code scanned but no test result in the Corona-Warn-App
The Corona-Warn-App has been active for a few weeks now and has been downloaded over 17.6 million times. An essential part of the app is the QR code procedure, which allows tested users to report test results to the app pseudonymously.
Note on the study by the Irish Trinity College
Fraunhofer IIS has conducted numerous tests of the interface vis-a-vis Google and Apple (so-called exposure notification interface) and discussed the results with SAP, Deutsche Telekom and the RKI to adjust the app’s configuration.
Corona-Warn-App version 1.2.1 available in Google Play Store
Version 1.2.1 of the Corona-Warn-App has been released in the Google Play Store. The update corrects the misleading sentence that the probability of infection is ranked as 'increased' even though the risk of infection is, in fact, low. Therefore, we recommend all Android users to install version 1.2.1 of the Corona-Warn-App.
Upgrade to iOS 13.6.1 improves interaction with the Corona-Warn-App
We recommend iOS users to upgrade the operating system to iOS 13.6.1 as it improves interaction with the Corona-Warn-App.
Corona-Warn-App version 1.2.1 is available in the App Store for iOS devices
Version 1.2.1 of the Corona-Warn-App has been released in the Apple App Store. The update fixes an error which caused the app to crash or prevented some users from opening the app. Therefore, we recommend all iOS-users to update the app to version 1.2.1.