Yes, HEV-Protokoll is free to download, however it contains in-app purchases or subscription offerings.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
HEV-Protokoll has several in-app purchases/subscriptions, the average in-app price is €62.66.
To get estimated revenue of HEV-Protokoll app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.