The app is completely secure to download. Simopt is the creator of Hrady a zámky, Maxův průvodce that is listed among the Books & Reference category. The latest update of this application was released on Aug 9, 2018 and the tool has been set up by over 10K users.
Google Play shows that the app is rated 4.2 by its users. It's free to download the installation package of Hrady a zámky, Maxův průvodce, also, you can have a look at users' reviews on Droid Informer.