World History Offline is completely offline history book app with all the events in history from -137, 00, 000, 000800 B. C - till date, ideal for preparation of competitive exams like IAS, UPSC and also useful for knowing about history of the world. The categories of the history are the following. 1. Ancient History (Before 800 B. C). 2. Ancient World (Before 0 B. C).