Appterix is a software platform from EgoMind GmbH for managing the lifecycle of security keys such as YubiKeys. It automates enrolment, assignment, PIN and certificate management and the blocking of lost keys, and according to the vendor also supports keys from Nitrokey and Swissbit. Further modules cover visualising FIDO2 sign-ins, a password vault, container encryption, application allow-listing, USB control and Windows privacy settings. Appterix can be taken as SaaS, as a managed service or on-premises. The company appears in the TeleTrusT "IT Security made in Germany" register.
EgoMind is headquartered in Karlsruhe, Germany; no parent company is named on the pages consulted. They do not state where the SaaS environment runs, so ask if data location matters. With the on-premises option you keep data in your own environment. The supplier falls under EU jurisdiction.