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ChemDraft

ChemDraft is an open-source, local-file-first chemical drawing application for macOS and Windows.

A structure grid rendered with ChemDraft.

Version 1.0.0 is available for macOS and 64-bit Windows. It is for students, researchers, and anyone who needs editable chemical structures, reaction schemes, figures, or machine-readable chemical files without sending a drawing to a web service.

Choose your path

I want to…	Start here
draw and export a structure	Quick Start
learn the drawing tools	Drawing Basics
write an extension	Writing a Plugin
use ChemDraft from an assistant or script	Agent Tools Overview
build or contribute to the application	Developer Guide

Highlights

• Draw molecules, rings, labels, stereochemical bonds, charges, mechanism arrows, and text on a paged document. Several documents can remain open as tabs in one window.
• Keep chemical information editable. Copy structures as SMILES, InChI, MOL, CDXML, SVG, or PNG; save native documents and work with supported interchange formats.
• Inspect a selected molecule with calculated properties and named interpretations. Results carry method and status information; a result that cannot be honestly computed is declined rather than guessed.
• Add optional tools through permission-declared plugins, including NMR prediction, naming, and experimental structure recognition.
• Automate local work through the chemdraft command-line interface, the chemdraft-mcp local MCP server, and the bundled agent skill.

ChemDraft is licensed under Apache-2.0. See Licensing and Notices for distribution details.

Next

• Install ChemDraft
• Explore the features
• See macOS and Windows differences