Table 2.
The sampled apps and their descriptive statistics (*: As discussed in the text, all data used for our analysis in this paper were gathered on Sept. 17, 2020)
| App | OS | First release date | # of downloads | Versions since first release | Reviews* |
||
|---|---|---|---|---|---|---|---|
| # of reviews (as of our analysis) | Avg. stars of reviews | Ratio of Android to iOS reviews | |||||
| 1-StopCOVID NI | Android | July 28, 2020 | 100,000+ | 2 | 195 | 3 | 2.01 |
| iOS | – | 97 | 2.5 | ||||
| 2-NHS COVID (ENG) | Android | August 13, 2020 | 100,000+ | 2 | 174 | 1.9 | 2.76 |
| iOS | – | 63 | 2.3 | ||||
| 3-Protect Scotland (SCO) | Android | September 10, 2020 | 100,000+ | 3 | 573 | 4 | 5.21 |
| iOS | – | 110 | 4 | ||||
| 4-COVID Tracker Ireland (IE) | Android | June 19, 2020 | 500,000+ | 3 | 1,463 | 2.9 | 5.34 |
| iOS | – | 274 | 3.1 | ||||
| 5-Corona-Warn Germany (DE) | Android | June 25, 2020 | 5,000,000+ | 8 | 20,972 | 2.7 | 3.10 |
| iOS | – | 6,772 | 2.3 | ||||
| 6-SwissCovid (CH) | Android | June 18, 2020 | 500,000+ | 9 | 1,370 | 3.1 | 2.10 |
| iOS | – | 652 | 3.1 | ||||
| 7-StopCovid France (FR) | Android | June 6, 2020 | 1,000,000+ | 10 | 2,397 | 2.6 | 9.95 |
| iOS | – | 241 | 2.1 | ||||
| 8- Stopp Corona Austria | Android | Mar 27, 2020 | 100,000+ | 10 | 1,961 | 2.4 | 3.27 |
| iOS | – | 599 | 2 | ||||
| 9-Finland Koronavilkku (FI) | Android | August 31, 2020 | 1,000,000+ | 3 | 1,276 | 3.4 | 5.41 |
| iOS | – | 236 | 3.3 | ||||