By Wikimedia CH
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Kiwix enables you to have the whole Wikipedia (an many other web sites) at hand wherever you go! On a boat, in the middle of nowhere or in Jail, Kiwix gives you access to the whole human knowledge. You don't need Internet, everything is stored on your mobile device!
Download the Kiwix program from the iTunes App Store then download the ZIM data files. You can download the ZIM file (or files) directly using the Kiwix App on your iPone, iPad, or iPod Touch - but this might take a long time and is liable to errors.
A faster and more reliable method is to use a computer to download the small torrent file for the large non-indexed ZIM file you want (not the pre-indexed package for Windows) from http://www.kiwix.org/wiki/Content_in_all_languages, then use a bit-torrent client (such a qTorrent) to download the actual ZIM data file to your computer. You then transfer the ZIM file to your iOS device using iTunes File Sharing.
What's New in Version 1.7.1
Improved iOS 10 compatibility
Absolutely the best offline Wiki yet!
It took three tries to get the wiki file downloaded, at 16GB it was quite a feat. But one the file was downloaded and opened I was awarded a full on Wikipedia encyclopedia. Offline. Stored on my phone. And the best part? It's EXACTLY like the website! No weird missing numbers. No weird missing charts. UI is exactly the same as the online version.
This app is great. I'm looking forward to the 50GB version with pictures when I get my new phone.