The app I've been looking for...
The only downside is not being able to search for Esperanto words. It's possible to browse, but with so many words it can take a while to find the one you're looking for. Oh well. Vikipedio browsing is flawless and better than some dedicated wikipedia apps. The grammar section is useful, and overall it looks like the author put some real thought into this app. Plus it's stable and fairly fast. Good work. Edit: Removed a comment about a small mistake in the app, as this was promptly fixed :)