# Corona-Warn-App

Native Android app using the Apple/Google exposure notification API. The CWA development ends on May 31, 2023. You still can warn other users until April 30, 2023. More information:

Repository: https://github.com/corona-warn-app/cwa-app-android
Canonical: https://ross.abutalabs.com/products/corona-warn-app
Homepage: https://coronawarn.app/en/faq/#ramp_down
Language: Kotlin
License: Apache-2.0
License Family: permissive
Archived: true
Last push: 2023-06-01T08:19:26+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2286, "days_push": 1189, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2394, forks 484 (observed 2026-08-28T04:06:43.481332+00:00)

## What it is
The official open-source COVID-19 exposure notification app for Germany, developed by SAP and Deutsche Telekom for iOS and Android using the Apple/Google Exposure Notification framework with a decentralized, privacy-preserving Bluetooth approach. Development officially ended on May 31, 2023, with warning functionality ceasing April 30, 2023.

## Use cases
- trace covid-19 exposures via bluetooth
- privacy-preserving contact tracing app
- exposure notification app for germany
- open source pandemic contact tracing
- pseudonymous proximity warning system

## When to choose
- studying a production-grade decentralized exposure notification implementation
- reviewing the architecture of a government-commissioned privacy-preserving tracing system
- auditing the historical source code of the Corona-Warn-App

## When to avoid
- you need an active contact tracing solution today - the app is discontinued
- you want a maintained codebase to contribute to
- you need exposure notification functionality in a currently supported app

## Facets
- artifact type: application
- maturity: abandoned
- function: security, privacy, mobile-framework
- domain: healthcare, privacy, mobile-development, self-hosted
- platform: cross-platform, self-hosted
- tags: covid-19, contact-tracing, exposure-notification, bluetooth, digital-health, german-government, end-of-life, android, ios

## Member repositories
- corona-warn-app/cwa-app-android (main) score 10
- corona-warn-app/cwa-documentation (docs) score 10
- corona-warn-app/cwa-server (backend) score 10
- corona-warn-app/cwa-app-ios (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:43.481332+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:44:54.856782+00:00, confidence not recorded.
  - readme: https://github.com/corona-warn-app/cwa-app-android (fetched 2026-08-28T04:06:43.481332+00:00, sha c9054bf71cb1)
- Data as of 2026-08-30T08:39:29.467469+00:00.