# MolChart

> MolChart (https://molchart.com) is a free, browser-based, AI-driven chemical structure editor. Users describe a molecule or an edit in plain English; the assistant draws it, checks valences, verifies the result against PubChem, and exports SMILES, MOL, PNG or SVG. No install, no account needed to start.

Key facts:
- Product type: web app (React front end, FastAPI back end with RDKit); works in any modern browser.
- Input: plain-English descriptions and edit instructions, chemical names, SMILES, MOL files.
- Output: SMILES, MOL (molfile), PNG, SVG; IUPAC name from structure; molecular formula, weight and properties; stereochemistry and valence checks; 3D view; reaction schemes.
- Verification: every AI edit is checked against the canvas state and against PubChem before it is accepted.
- Pricing: free – 200 AI messages per browser without an account, 1,000 per month with a free account; Member $30/month – 5,000 messages per month.
- Integrations: ChatGPT app; MCP (Model Context Protocol) server at https://molchart.com/mcp for AI assistants; REST API under https://molchart.com/api/.
- Good for: students, teachers, chemists and writers who need a correct 2D structure quickly; a lightweight ChemDraw / MarvinSketch alternative for drawing and exporting structures.
- Company: MolChart, operated from the United States. Contact: via the site.

## Pages
- [MolChart editor](https://molchart.com/): the app itself.
- [Draw molecules online](https://molchart.com/draw-molecules-online.html): how the AI editor works, example prompts.
- [SMILES to structure](https://molchart.com/smiles-to-structure.html): paste SMILES, get a drawing/image/MOL; name to SMILES.
- [Structure to IUPAC name](https://molchart.com/structure-to-iupac-name.html): naming and properties.
- [ChemDraw alternative](https://molchart.com/chemdraw-alternative.html): comparison with ChemDraw and other editors.
- [Common molecule examples](https://molchart.com/molecule-examples.html): caffeine, aspirin, glucose… with SMILES and formulas.
- [Privacy policy](https://molchart.com/privacy.html)
- [Terms of service](https://molchart.com/terms.html)

## Optional
- [Full description for LLMs](https://molchart.com/llms-full.txt)
- [MCP endpoint](https://molchart.com/mcp): streamable-HTTP MCP server exposing draw/analyze tools.