BookI

Have you dreamed of having all Wikipedia offline on your phone, which you can check while traveling or when you do not have internet connection?

This app is the smallest-I-know and fastest-I-know offline reader for Wikipedia (and other books), with his own "squeeze-all-in" format. Some example, the entire Wikipedia in English (6764322 articles) is about 18GB. Still big, but not so big for modern phones... plus, all titles of the articles are indexed, for a fast search.

The downside? The interface is minimal and focused mostly on reading text (that is what counts, no?)