Torrey New Topical Textbook contains 23,500 topics and sub-topics with reference to the Holy Bible, on an application that can be used everywereh, even off-line without internet connection.
This app is very user-friendly, as it offers an easy search function, a list of all topics from A to Z and a random-feature, which can be useful for students and lectures at your spare time.
The screen is visually clear and offers a detailed but still understandable explanation.
You can determine some terms as your favourites and collect them seperately. This feature can be managed easily.
If there are topics which you would like to add, you can create new categories and add this term in the respective category, so that you can look it up, whenever you want.
Thanks to the unlimited ability of adding new topics, you can create and customize your own little sub-dictionary (according to locations, happenings)