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

- Supports both plain TeX and LaTeX, output PDF;
- Supports XeLaTeX (online compiling, requires PRO subscription);
- Fast compiler optimized for iOS devices;
- On-demand package auto downloader, including big packages like beamer;
- Integrated BibTeX/MakeIndex;

- A text editor designed for LaTeX editing. With syntax highlighting, customizable assistant keyboard, powerful commands.
- Side by side PDF preview with auto reload after compilation.
- TeX-aware spell checking (cmd -> spell)
- Handy customizable assistant keyboard for inserting special characters.
- Open .tex file from other applications
- export & print pdf
- Customizable UI appearance (via twilit.l)

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

- Package download acceleration;
- Automatic eps-to-pdf conversion with online service;
- Payment will be charged to iTunes Account at confirmation of purchase
• Length of subscription is 1 year
- Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period
- Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal
- Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase
- No cancellation of the current subscription is allowed during active subscription period
- Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication"
- Privacy and Term of Use:

- Visit for user guide, and templates for russian, chinese, japanese.
- Email to send bug report and feature requests.
- Or directly talk to @litchiedev on Twitter.

What's New

Version 5.0

Major redesign
- entire new text editor
- support split view: tex and pdf side by side
- better spell check with suggestions
- open multiple files at the same time
- copy file in file list
- fully customizable UI
- other bug fixes

Ratings and Reviews

4.4 out of 5

8 Ratings

8 Ratings

Very useful & fast

Engine lover

I initially balked at paying nearly £10 for an app that I wasn’t sure would do what I needed but I’m glad I took the plunge.

Handles the paper I’m working on with aplomb. Performance is impressive (although I’m using on an iPad 10.5) and the PDF previewer is very helpful. I’m not doing anything sophisticated with the LaTeX I’m writing but have not had any issues. It’s always generated the correct output given the input and correctly raised errors when I’ve made mistakes. Has also seamlessly working with the .cls file I’m using and bibtex source.

I’m using an external keyboard which I suspect helps a lot.

I’ve given 4 starts, not 5, as although the interface works I think it needs more tutorial or manual info to explain. I don’t always find it intuitive. For example, I’m not a fan of the bespoke select, copy and pasting functionality - I don’t understand why the app doesn’t just use standard iOS capabilities? I agree with other reviewers that it would be nice to have spellchecking integrated too.

Apart from interface improvements, my main feature request would be to support the PDF previewer side by side with the main editing window. Fortunately the app supports iOS split screen, so I have a workaround of export the generated PDF into a separate PDF app and displaying alongside Tex Writer. Not as nice though as automatically updating whenever PDF
is regenerated in Tex Writer.

So overall a good, productive app - with scope to improve and be even better.

Developer Response

I hope you find 5.0 useful.



Really does the job! Has made a tremendous difference to utility of iPad. Easy to write. Dropbox integration fabulous. File management pretty good.

Very useful.

Frederick bloggs

Use this on the road. Great job!


Chaoji Li
56 MB
Requires iOS 11.0 or later. Compatible with iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, iPad mini 4, iPad mini 4 Wi-Fi + Cellular, 12.9-inch iPad Pro, 12.9-inch iPad Pro Wi-Fi + Cellular, 9.7-inch iPad Pro, 9.7-inch iPad Pro Wi-Fi + Cellular, iPad Wi-Fi (5th generation), iPad Wi-Fi + Cellular (5th generation), 12.9-inch iPad Pro (2nd generation), 12.9-inch iPad Pro Wi‑Fi + Cellular (2nd generation), 10.5-inch iPad Pro, 10.5-inch iPad Pro Wi‑Fi + Cellular and iPod touch.
Age Rating
Rated 4+
© (C) 2012-2018, Chaoji Li.
In-App Purchases
  1. Basic £4.49


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

More By This Developer

You May Also Like