TK-App is a free Android app designed by Techniker Krankenkasse that serves as an all-purpose digital tool for health and fitness. Aimed at enhancing convenience and accessibility, this application serves as a hub for various health-related functions, which should make it easier for customers to manage their health data and engage with their health insurance benefits.

The app's standout features include secure login, which should ensure the protection of sensitive data by disallowing rooted devices. Users can seamlessly transmit sick notes and documents, exchange messages with the Techniker, and receive correspondence from them. The app also integrates the TK bonus program, which should enable users to digitally participate and earn rewards. It further offers TK-Fit, allowing access to health and fitness data from Google Fit, Samsung Health, or Fitbit. The app provides an overview of prescribed drugs over the past six years and facilitates the reimbursement process for various medical expenses, including medicines, vaccines, osteopathy, and health courses.