LetX
Write LaTeX together. The AI runs the build.
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LetX - Write LaTeX together. The AI runs the build.

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Most AI tools hand you LaTeX and leave you to paste it somewhere and hope it builds. Lexi works inside the project: it creates and edits files, builds tables and TikZ diagrams, fixes your bibliography, compiles, reads the real latexmk log, and fixes what it reported. Every edit snapshots first, so it can be reverted. Connect Claude or ChatGPT over MCP and they get the same project: 1,019 templates, create, edit, compile. Unlimited collaborators on every plan. Overleaf's free tier allows one.

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letX has been live since January and 3,112 people are using it across 268 universities and research labs. Today is the first time I have asked anyone to look. I kept losing afternoons to LaTeX that would not compile. Not to writing it: to a missing brace on line 340, an undefined citation, a table that silently overflowed the margin. Every AI writing tool I tried did the same thing. Hand me LaTeX, wish me luck. They cannot compile, so they have never seen my log. letX runs a real TeX Live farm, so Lexi does the loop a person does: edit, compile, read what latexmk said, fix that line, compile again. Every edit snapshots first, because an AI with write access to your thesis needs an undo that works. Free gives you unlimited collaborators, all 1,019 templates and the whole editor. That is not going to change. Tell me what breaks for you. I am here all day.
Maker

Update, October: since launch we've gone from 3,112 to 5,800+ people signed up, at 440+ universities and research labs in 65+ countries (268 at launch). New since then: a Team plan for labs and classes (2 to 50 people, $20 per seat), LetX in Claude's connector directory, and a 66-second film of how it works. Thank you to everyone here who tried it early.

Maker

Excited to finally share LetX with the community!

One of our biggest technical focuses was solving the classic "blind AI" problem in LaTeX. Instead of just spitting out code snippets that break your build, Lexi actually loops over the compiler diagnostics and fixes compilation errors directly against real TeX Live outputs. On top of that, every edit automatically snapshots so you never have to worry about an AI wrecking a paper right before a deadline.

Would love to hear what workflows or templates you’d like to see next, and please let us know if you find any edge cases that break!