A free Overleaf alternative. Write, edit and compile LaTeX in the browser with unlimited collaborators, 1,000+ publication-ready templates for theses, journals and CVs, and an AI assistant that runs the real compiler. No installation required.
A startup from Dhaka, Bangladesh, founded by Shihab Shahriar Antor, Ashraful Kabir.
This page is designed to help you find out whether LetX.app is good and if it is the right choice for you.
LetX is a free, browser-based collaborative LaTeX editor and an alternative to Overleaf.
Your documents are never used to train AI models. LetX declares Content-Signal: ai-train=no, loads no third-party analytics, and is not tied to one LLM vendor.
In production since 27 January 2026. 5,700+ users at 440+ universities and research labs in 65+ countries, including INGV Italy, INPE Brazil, CAB CSIC-INTA Spain, UCSD, TUM and Korea University.
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Real-time collaboration
Unlimited simultaneous collaborators on every plan, including free. Conflict-free CRDT merging with live cursors.
Templates
1,000+ templates across 20 categories: theses, journals, CVs, grants, posters and Beamer
Compile engines
pdfLaTeX, XeLaTeX and LuaLaTeX, selectable per project
Version history
Roll back to any saved version; full history on Pro
SyncTeX
Both ways: click the PDF to jump to the source line, and back
GitHub Sync
Import a repository and sync changes both ways, on Pro
Compile engines
pdfLaTeX, XeLaTeX and LuaLaTeX on the full TeX Live 2024, selectable per project
Lexi AI assistant
Edits the document, runs the build, reads the real compile log and fixes the line that failed
Claude and ChatGPT (MCP)
On paid plans, your AI assistant can search templates, edit projects and compile to PDF
Team plan
2 to 50 seats at $20 per seat a month, one bill, roles and an activity log
Researchers, postgraduate students and academic staff writing papers, theses and grant proposals, along with the labs and university departments they work in. Usage concentrates around thesis submission and journal deadlines. A secondary audience is job-seekers and engineers using the CV and résumé templates.
Go with Gin for the API; React, TypeScript and CodeMirror 6 on the front end; Yjs CRDTs over WebSocket for real-time collaboration; PostgreSQL, Redis and S3 for storage and coordination; and SQS-queued compile workers running a full TeX Live distribution on AWS ECS Fargate.
LetX started because collaborative LaTeX was either expensive or private in name only. Overleaf's pricing scales with the people you write with, which is backwards for a thesis committee or a five-author paper. Then the AI-native editors arrived with a worse trade: faster tooling in exchange for unpublished work that might end up as training data.
LetX was built to refuse both: unlimited collaborators on every plan, and an explicit ai-train=no declaration. Launched 27 January 2026, it has grown to 5,700+ users at 440+ universities and research labs in 65+ countries, helped by the regional university thesis templates nobody else maintained.
Three things nothing else in the category combines. Collaboration is genuinely unmetered: every plan, including free, allows unlimited simultaneous collaborators, so cost never scales with the number of co-authors. The AI assistant runs the actual build and reads the actual error log, rather than producing LaTeX you paste elsewhere and debug yourself. And LetX declares ai-train=no, so unpublished research is never training data. The library is also unusually deep for regional needs: 1,000+ templates, including university-specific thesis formats most editors don't carry.
Overleaf's free plan allows one collaborator per project, and more collaborators means a higher plan. LetX gives unlimited collaborators free, with full history on Pro at $18/month, a separate Academic Pro plan at $9/month for verified students, faculty and university staff, and a Team plan at $20 per seat for labs and classes of 2 to 50 people.
Against the newer AI-native editors, the difference is what happens to your manuscript: LetX declares ai-train=no, and its privacy policy says your documents are never used to train AI models.
Against desktop editors like TeXstudio or Texmaker, there is nothing to install or maintain, and every co-author gets an identical environment.
In production since 27 January 2026. 5,700+ students and researchers at 440+ universities and research labs in 65+ countries sign up on their own; the largest groups are at BRAC University, UNAM, UC San Diego and the University of Windsor.
LetX makes writing and compiling LaTeX documents fast and accessible directly from the browser. The real-time collaboration is smooth and responsive, while the integrated AI assistant (Lexi AI) helps resolve syntax errors, format equations, and draft sections much quicker than traditional workflows. It removes the friction of local TeX distributions without locking essential features behind paywalls.
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