A free program for Android, by IN Groupe.
TousAntiCovid is a French Government Verification Application for French and European Health Certificates (EU-DCC: Digital Covid Certificate).
The TousAntiCovid application allows you to carry out health certificate checks in totally offline mode.
You will not need to be connected to the Internet or to a server to verify a health certificate. On the other hand, you must regularly be connected to the Internet (GSM/WiFi network) for the application to work properly.
The TousAntiCovid application is updated on a regular basis.
It is used to check the authenticity of the EU-DCC and to verify the results of the EU-DCC for mobile phones.