Best TeX app on the market

This supports editing and PDF preview, and can integrate with Dropbox, which is a useful idea (Ive yet to explore that so read others reviews for that). There are a couple idiosyncrasies to the user interface but youll get used to it quickly. Worth the ten bucks for when you want to mess with math on the go.

Hoping2LearnSpanish about TeX Writer - LaTeX On The Go, v2.8.4