ChemStitch

ChemStitch is a web-native chemical structure editor for chemists — academic researchers, graduate students, postdocs, and industry chemists in pharma, biotech, contract research, and chemical manufacturing. It pairs a familiar drawing canvas with an integrated AI chat that answers questions about whatever molecule is on screen: physical and chemical properties, reaction predictions, retrosynthetic disconnections, IUPAC nomenclature — without copy-pasting structures into separate tools.

Unlike ChemDraw and ChemDoodle, ChemStitch requires no desktop install and no per-seat licensing workflow. Unlike free open-source editors like Ketcher and JChemPaint, ChemStitch adds property prediction, IUPAC naming, AI-assisted retrosynthesis, and natural-language conversation tied to the canvas.

Features:

• Drawing canvas with full structural-formula support (atoms, bonds, charges, stereochemistry, reaction arrows)
• AI chat tied to the active molecule — property queries, retrosynthesis, IUPAC naming, reaction prediction
• Import/export: SMILES, InChI, MOL V2000/V3000, SDF, RXN, CDXML (ChemDraw's native format)
• Standalone tools: molarity calculator, dilution calculator, serial-dilution planner
• Bring-your-own-AI-key (BYOK) — use your own Anthropic or OpenAI key, or use the managed AI
• Magic-link sign-in (no passwords); institutional and corporate emails welcome
• Cross-platform via the browser; no install required

Built for publication-focused workflows: reaction-scheme drawing for manuscripts and patents, SMILES/InChI/MOL/SDF data handoff to cheminformatics pipelines, AI-assisted property prediction for medicinal-chemistry triage, IUPAC name generation for thesis and regulatory documentation.

Free 14-day trial, no credit card required.