In a nutshell: There is no ERF Bibleserver app for Android or iOS.
There are several reasons for this. One main reason is that our unique range of Bible translations does not allow us to offer them within an app. The license agreements with the Bible societies only provide for the use on the website bibleserver.com.
The website ERF Bibleserver provides the complete functionality on mobile devices and works very similar to an app. Only the offline-function, which is common for apps, is not available via the website.