Table 1.
Background information provided by the issuers of the apps.
| App | Country | Open-source repository | Information websites |
| Corona Warn App | Germany | Yes | Yes |
| TousAntiCovid | France | Yes | Yes |
| Immuni | Italy | Yes | Yes |
| Radar COVID | Spain | Yes | Yes |
| Koronavilkku | Finland | Yes | Yes |
| NHSa COVID-19 | England and Wales | Yes | Yes |
| TraceTogether | Singapore | Yes | Yes |
| Self-Diagnosis app | South Korea | No | No |
| Self-Quarantine app | South Korea | No | No |
| Coronavirus-SUSb | Brazil | No | No |
| Various integrated tracing functions in apps (eg, WeChat) | China | No | No |
aNHS: National Health Service.
bSUS: Sistema Único de Saúde.