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LetX · Lexi

Lexi edits LaTeX and checks the result with the compiler.

Lexi reads the active project, bibliography, and compile log. It edits source, runs the selected compiler, and returns the PDF or error log.

Open the official Lexi guide

Workflow

Four steps.

01

Read the project

Lexi can use the open project’s files, bibliography, and compiler output as context.

02

Edit in place

It changes the source files in the LetX project.

03

Run the compiler

LetX tests the edited source with the selected LaTeX compiler.

04

Inspect the result

LetX returns a PDF or an error log. The prior project version remains available in history.

Published command surface

Eighteen commands, grouped by job.

Repair

/fix

Read the compile error, locate the responsible source, apply a correction, and compile again.

Build

/table · /diagram · /figure · /slides · /beamer

Create structured LaTeX content, TikZ figures, and presentations inside the current project.

Convert

/image-to-tex · /pdf-to-tex · /convert

Turn a visual or document source into editable LaTeX rather than an opaque image.

Research

/cite

Find and insert a citation while keeping the bibliography in the project workflow.

Edit

/format · /shorten · /humanize · /clean · /translate

Make targeted prose or formatting changes without replacing the entire document.

Understand

/explain · /outline · /scaffold

Explain existing source and create a usable structure before drafting.

Compiler checks

  • The edited source is accepted by the selected compiler
  • The project produces a PDF or a specific compiler error
  • The source change remains available for inspection
  • The prior version remains available in project history

Not checked by compilation

  • ×Mathematical correctness
  • ×Whether a citation supports a claim
  • ×Originality or publication readiness
  • ×Compliance with every journal or university rule

Questions

Questions and answers.

What is Lexi?

Lexi is LetX’s in-editor LaTeX agent. It can read the current project and compiler output, edit source files, compile the result, and use the new log to continue the task.

Does Lexi train on private documents?

LetX’s published privacy policy says private documents are not used to train AI models without explicit opt-in consent.

Is Lexi free?

Lexi is a Pro feature with a monthly allowance. LetX’s Free plan still includes the collaborative editor, templates, 40 daily compiles, and unlimited collaborators.

Can I undo a Lexi edit?

LetX records prior project versions. The Lexi guide specifically describes edits as recoverable through project history.

Primary sources

Official Lexi guideLetX pricingLetX privacy policy

Product behavior and plan details were checked August 29, 2026. Verify the official LetX pages before making a purchase or security decision.