Most AI tools hand you LaTeX and hope it builds. Lexi works inside the project: it 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. On paid plans, Claude or ChatGPT can work on the same project over MCP. 1,000+ templates. Unlimited collaborators on every plan; Overleaf's free tier allows one. Team plan for labs and classes: $20 per seat.
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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!
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.