The Smartphone Component of the App connects to the Cloud Component
The following diagram illustrates this architecture. Unlike most uses of this architecture, COVID-19 Apps often provide Peer Communication between smartphones running the same App (e.g. using Bluetooth for contact tracking purposes).
- Most installable smartphone apps
- Architecture Overview of the German Corona-Warn-App
- can be cheaper to operate as data storage does not need to centralized;
- can provide more user privacy if user data is kept on the smartphone;
- all smartphone capabilities provided by the smartphone operating system are available for use (e.g. for Peer Communication);
- implementation technologies, and developers with appropriate skills are widely available.
- more code needs to be written and tested; development is more expensive;
- more skill sets required on the development team;
- additional components and communication channels need to be defended.