What If? - xkcd Companion app for iPhone and iPad

Read What If? articles (http://what-if.xkcd.com) from your phone. You can save the articles on your device for offline reading.

Features:
- Save the articles for offline reading
- Ability to toggle between the saved version and the web version
- Tap to read title text of images
- Flag articles as favorite
- Search
- Filter articles by favorite, unread or downloaded status
- Native handling of links and references
- Offline rendering of mathematical formulae in the articles
- Share articles with friends