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Corona Contact Tracing Germany

Trace Corona in Germany
This is a fork of the official German Corona-Warn-App (CWA) without proprietary dependencies. While the app itself is Free Software, it depends on Google’s proprietary Exposure Notification Framework. This fork instead uses the drop-in compatible microg implementation. CCTG is fully compatible with the official app, including recording and sending tracing data as well as test submission and result collection.

Trace corona infections. For contact tracing, the app collects short-lived IDs via bluetooth and broadcasts its own. In case of an infection, it allows to upload ones own IDs to a server using a TAN, allowing contacts to notice a match with their collected IDs and to be notified. All that happens without storing more data than necessary.

Check in. Another way of warning at-risk persons is by checking in to events and locations using CCTG. Hosts may use the app to generate a QR code that guests can scan. In case of an infection, users who were checked in at the same time or arrived shortly after the infected person left can be warned.

Retrieve test results. It is possible to receive test results for participating testing points both for PCR as well as rapid antigen tests. For the latter, it is additionally possible to generate a proof of the test result to be displayed through the app. To speed up registration at the rapid testing point, the app allows generating and storing a QR code that contains the personal data of the person to be tested.

EU Digital COVID Certificate. The application can store and display EU Digital COVID Certificates, no matter whether they proove a vaccinaition, a negative test result or a recovery from the infection. For test results added to the app, it can query the corresponding certificate directly in the application. A given certificate can be tested against the business rules of any EU country to verify whether this certificate permits entering the country.

Additionally, the app shows statistic cards regarding the rate of infections as well as the progression of the vaccination campaign in Germany and provides a contact journal for manually entering people one has met.

Transnational exposure logging. Users outside of Germany can use the app and be warned about exposures in participating countries, but they won't be able to retrieve test results through the app. In a positive PCR test result indicates an infection, they may call the TAN hotline and enter the TAN within the app to warn their contacts.

Lollipop support. Android 5 is supported, however, Bluetooth drivers on older devices might not support a required feature for full support; see this list for whether an old device supports this app. Not fully compatible devices will show a notice on the main screen.

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Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

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  • Version 2.26.0.0 (2260004) - Added on 2022-09-09

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • pair with Bluetooth devices
      Allows the app to view the configuration of the Bluetooth on the phone, and to make and accept connections with paired devices.
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • access Bluetooth settings
      Allows the app to configure the local Bluetooth phone, and to discover and pair with remote devices.
    • connect to paired Bluetooth devices
      Allows the app to connect to paired Bluetooth devices
    • access location in the background
      This app can access location at any time, even while the app is not in use.
      (11)
    • access approximate location only in the foreground
      This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
      (11)
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
      (11)
    • advertise to nearby Bluetooth devices
      Allows the app to advertise to nearby Bluetooth devices
    • discover and pair nearby Bluetooth devices
      Allows the app to discover and pair nearby Bluetooth devices
    • com.google.android.gms.nearby.exposurenotification.EXPOSURE_CALLBACK
    • run foreground service
      Allows the app to make use of foreground services.

    Download APK 17 MiB PGP Signature | Build Log

  • Version 2.25.0.0 (2250002) - Added on 2022-08-07

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • pair with Bluetooth devices
      Allows the app to view the configuration of the Bluetooth on the phone, and to make and accept connections with paired devices.
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • access Bluetooth settings
      Allows the app to configure the local Bluetooth phone, and to discover and pair with remote devices.
    • connect to paired Bluetooth devices
      Allows the app to connect to paired Bluetooth devices
    • access location in the background
      This app can access location at any time, even while the app is not in use.
      (11)
    • access approximate location only in the foreground
      This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
      (11)
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
      (11)
    • advertise to nearby Bluetooth devices
      Allows the app to advertise to nearby Bluetooth devices
    • discover and pair nearby Bluetooth devices
      Allows the app to discover and pair nearby Bluetooth devices
    • com.google.android.gms.nearby.exposurenotification.EXPOSURE_CALLBACK
    • modify or delete the contents of your shared storage
      Allows the app to write the contents of your shared storage.
    • read phone status and identity
      Allows the app to access the phone features of the device. This permission allows the app to determine the phone number and device IDs, whether a call is active, and the remote number connected by a call.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • run foreground service
      Allows the app to make use of foreground services.

    Download APK 28 MiB PGP Signature | Build Log

  • Version 2.24.2.1 (2240202) - Added on 2022-07-31

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • pair with Bluetooth devices
      Allows the app to view the configuration of the Bluetooth on the phone, and to make and accept connections with paired devices.
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • access Bluetooth settings
      Allows the app to configure the local Bluetooth phone, and to discover and pair with remote devices.
    • connect to paired Bluetooth devices
      Allows the app to connect to paired Bluetooth devices
    • access location in the background
      This app can access location at any time, even while the app is not in use.
      (11)
    • access approximate location only in the foreground
      This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
      (11)
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
      (11)
    • advertise to nearby Bluetooth devices
      Allows the app to advertise to nearby Bluetooth devices
    • discover and pair nearby Bluetooth devices
      Allows the app to discover and pair nearby Bluetooth devices
    • com.google.android.gms.nearby.exposurenotification.EXPOSURE_CALLBACK
    • modify or delete the contents of your shared storage
      Allows the app to write the contents of your shared storage.
    • read phone status and identity
      Allows the app to access the phone features of the device. This permission allows the app to determine the phone number and device IDs, whether a call is active, and the remote number connected by a call.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • run foreground service
      Allows the app to make use of foreground services.

    Download APK 28 MiB PGP Signature | Build Log