• Sail Learn

• Android

• Dart

This App is only in German (for Germany, Austria & Switzerland). This App is about sailing, sailing theory and the rules on the water. It also has some quiz where you can test your knowledge!

sail.davidkoenig.de PlayStore

• Atmosferico

• Android

• Dart

The small weather Atmosferico app stands out with a simple, calm design. It is possible to retrieve the weather data by location or by active search. (for Germany, Austria & Switzerland)

atmosferico.davidkoenig.de PlayStore