For 7.99 Euro I can purchase Texpad in the Apple store. It is just 11.4 MB, so it won't be as complete as my TeX Live 2012. Has anyone experience, how complete it is? Is it just the standard classes or could I prepare my Beamer slides with it?

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You should have a look at these blog entries : tex.blogoverflow.com/2011/10/i-tex-therefore-ipad and the following tex.blogoverflow.com/2012/09/i-tex-therefore-ipad-reloaded I'm not sure it regards exactly the same tex distribution as you are looking for, but it seems it will help you in your quest anyway. –  T. Verron Nov 17 '12 at 9:13
The idea of having to purchase TeX for money makes me worried :-S –  tohecz Nov 17 '12 at 9:23
@tohecz as far as I can see (from the description, I haven't got an ios device) you do not get TeX at all, what you get for the money is an editor and access to a TeX server which will process your documents and return the resulting pdf and/or error report. However there have been many commercial TeX distributions over the years: Textures, pctec, Y&Ytex etc, so charging for a tex distribution wouldn't be that unusual. –  David Carlisle Nov 17 '12 at 13:14
@DavidCarlisle, you are right. It's just the editor. I had assumed I would get a (somehow) minimal LaTeX as well. –  Uwe Ziegenhagen Nov 17 '12 at 19:15
@UweZiegenhagen The problem is that "minimal LaTeX" is much larger than that... And David: it still makes me worried... –  tohecz Nov 17 '12 at 22:00

Since version 1.1 Texpad for iOS has had a built in LaTeX typesetter, no internet connection required. Most commonly used LaTeX packages are now included, and we expand the distribution with every update (9 updates in the past three months), and it is now so good that one user edits LaTeX on his Mac and typesets on his iPhone because the distribution is leaner, simpler and faster.

PGF drivers are underway right now and the update with local TikZ/Beamer typesetting should be ready for download in Feburary.

In addition to the onboard typesetter, we still provide free cloud typesetting servers with the entirety of TexLive 2012 installed. If you have any further questions, email us at support@vallettaventures.com.