Get the installation package of RegioApp 2.1 that is available for free and have a look at users' reviews on Droid Informer. It's secure to download the app. This application has been originally created by Bundesverband der Regionalbewegung e.V. and it belongs to the Travel & Local category.
The tool was downloaded and set up by over 10K users and its most recent stable update was on Jan 16, 2018. RegioApp was rated 2.7 on Google Play.