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. 2021 May 14;16(5):e0251867. doi: 10.1371/journal.pone.0251867

Table 3. TLS server security level rating of external URLs per app.

App Number of URLs Domain ratings Domains
Stopp Corona 3 A https://cdn.prod-rca-coronaapp-fd.net
A https://app.prod-rca-coronaapp-fd.net
A+ https://sms.prod-rca-coronaapp-fd.net
Coronalert 5 A https://c19statcdn-prd.ixor.be
A coronalert-prd.ixor.be
A c19statcdn-prd.ixor.be
A c19-submission-prd.ixor.be
A c19-verification-prd.ixor.be
ViruSafe 1 A https://virusafe.io/
Stop COVID-19 0
CovTracer 2 A https://kiosapps.ucy.ac.cy
B covtracer.dmrid.gov.cy
eRouska 1 A+ https://erouska.cz
Smittestop 0
Hoia 4 A https://www.digilugu.ee
A+ https://www.terviseamet.ee
A+ https://hoia.me
A https://enapi.sm.ee
KoronaVilkku 2 A https://omaolo.fi
A+ https://repo.thl.fi
TousAntiCovid 5 B https://api.stopcovid.gouv.fr
B https://tacw.tousanticovid.gouv.fr
T https://stopcovid.gouv.fr
T https://app.stopcovid.gouv.fr
A https://tac.gouv.fr
Corona-Warn-App 1 N/A (dead link) https://submission.coronawarn.ap
VirusRadar 2 B https://f-droid.org
A+ https://github.com
COVID Tracker 0
Immuni 1 A+ https://www.immuni.italia.it
Apturi Covid 3 A+ https://apturicovid-files.spkc.gov.lv
A+ apturicovid-api.spkc.gov.lv
A+ apturicovid-files.spkc.gov.lv
Korona Stop LT 3 B https://download.koronastop.lt
B https://submission.koronastop.lt
B https://verification.koronastop.lt
COVID Alert 4 B https://tools.ietf.org
A https://data.ws.covidalert.gov.mt
A https://authz.ws.covidalert.gov.mt
A https://config.ws.covidalert.gov.mt
CoronaMelder 2 A+ https://coronamelder-api.nl
B https://productie.coronamelder-dist.nl
Smittestopp 1 A https://in.appcenter.ms
STOP COVID—ProteGO Safe 2 A+ https://safesafe.app
A+ https://v4.safesafe.app
STAYAWAY COVID 2 F https://stayaway.min-saude.pt
A https://stayaway.incm.pt
ZostanZdravy 1 B https://t.mojeezdravie.sk
#OstaniZdrav 0
Radar COVID 1 A https://radarcovid.covid19.gob.es
SwissCovid 3 A https://www.pt1.bfs.admin.ch
T https://www.pt.bfs.admin.ch
A https://codegen-service.bag.admin.ch
NHS COVID-19 0
Total 49 13xA+, 21xA, 10xB, 3xT, 1xF