[iPhone God App] It was found using the TeX WriterLaTeX Editor and Compiler actually

Writing and compiling TeX files on the go. No internet connection needed.

FULL TeX/LaTeX SUPPORT
- Supports both plain TeX and LaTeX, output PDF;
- Fast compiler optimized for iOS devices;
- On-demand package auto downloader, including big packages like beamer;
- Integrated BibTeX/MakeIndex;

DESIGNED FOR PROFESSIONAL WRITERS
- A text editor designed for LaTeX editing. With syntax highlighting, innovative text selection, customizable assistant keyboard, powerful commands.
- LaTeX-aware spell checking (optional in settings)
- Handy image preview for inserting graphics;
- Support "Paste" images into editor
- Handy customizable assistant keyboard for inserting special characters.
- Open .tex file from other applications

SHARING
- Dropbox real time syncing, with file comparison and manual conflict resolution
- WebDAV
- PDF export/email

HOW TO GET HELP
- Visit texwriterapp.com for user guide, and templates for russian, chinese, japanese.
- Email support@litchie.com to send bug report and feature requests.
- Or directly talk to @litchiedev on Twitter.