When comparing Aard 2 vs Kiwix, the Slant community recommends Aard 2 for most people. In the question“What is the best Wikipedia client on Android?” Aard 2 is ranked 1st while Kiwix is ranked 2nd. The most important reason people chose Aard 2 is:
Not only can some pages be downloaded for offline view, the whole Wikipedia can be stored on sdcard for offline access to all articles.
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Pros
Pro Complete offline wikipedia database
Not only can some pages be downloaded for offline view, the whole Wikipedia can be stored on sdcard for offline access to all articles.
Pro Complete offline wikipedia database
Not only can some pages can be downloaded for offline view, the whole of wikipedia can be stored on sdcard for offline access to all articles.
Pro Can open ZIM-database files
Uses a database called ZIM with an open architecture.
Pro Open source under GPL
Cons
Con Wikipedia has to be manually installed
The app doesn't include the wikipedia database, it has to be downloaded and installed manually.
Con No online viewing of wikipedia articles
A database with wikipedia articles must be downloaded before, otherwise you will not see any wikipedia article.