Steinau BlueSecur

Steinau BlueSecur is a companion app for operating BlueSecur–compatible devices and securely sharing access by sending keys to family or friends via a Germany-based server. Keys are managed in-app and recipients can receive access even when you’re away from home. If a recipient doesn’t have the app, they’ll be directed to the app store for installation.

Key features include adding devices by scanning QR codes, offline setup and operation, administrator-controlled permissions (temporary or permanent) that can be deleted, and a fee structure for key sets with free one-time keys. The system supports up to 250 users, optional external antenna for extended range, and notes that background Bluetooth use may reduce battery life.