Table 3.
Contact-tracing distance and time of contact-tracing apps (CTAs).
| Country | App | Contact-tracing distance (m） | Contact-tracing time (min） |
| Japan | COCOA | 1 | 15 |
| Kazakhstan | Saqbol | 2 | 15 |
| Uzbekistan | Self Safety | 5 | 1 |
| Denmark | Smittestop | 1 | 15 |
| Ireland | COVID Tracker | 2 | 15 |
| France | TousAntiCovid | 2 | 5 |
| The Netherlands | CoronaMelder | 1.5 | 15 |
| Belgium | Coronalert BE | 1.5 | 5 |
| Switzerland | SwissCovid | 1.5 | 15 |
| The Czech Republic | eRouška | 2 | 7 |
| Hungary | VirusRadar | 2 | 20 |
| Latvia | Apturi Covid Latvia | 2 | 15 |
| Lithuania | Korona Stop LT | 2 | 15 |
| Portugal | StayAway Covid | 2 | 15 |
| Spain | Radar COVID | 2 | 15 |
| Tunisia | E7mi | 3 | N/Aa |
| South Africa | COVID Alert SA | 2 | 15 |
| Australia | COVIDSafe | 1.5 | 1 |
| Canada | COVID Alert | 2 | 15 |
| The United States | NOVID | 2.7 | 15 |
| Georgia | Stop Covid | 2 | 15 |
aN/A: not applicable.