Apps I am building
This site gives an overview of my own apps and their current status.
Currently
Three apps, with an honest status.
MyOpeningLab
A chess opening trainer with spaced-repetition training, PGN import, and custom repertoires, live in eleven languages.
E-invoicing tool
Creates and validates XRechnung and ZUGFeRD, coming soon to the Play Store.
Safe Spark
In development, coming to the Play Store in the near future.
All apps at a glance
Detailed descriptions and screenshots are on the apps page.