COVID Certificate is the official app for storing and presenting Swiss COVID certificates.
The certificate requirement within Switzerland has been lifted since 17 February 2022. Covid certificates may still be required for travel activities outside of Switzerland, depending on the measures of the respective country, which is why they will continue to be issued. Covid certificates that have already been issued retain their current period of validity. Furthermore, it is within the competence of the cantons to order measures (such as compulsory certification) within their canton to prevent the spread of communicable diseases.
Please check this page for more information.
Covid-19: What is opening and when?
Federal Office of Public Health: Information on the Covid Certificate