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Compare Chemical Structure Editors

Last updated: March 2026

An honest feature-by-feature comparison. We show where ChemStitch leads and where other tools may be a better fit for your workflow.

Why the landscape is shifting

In January 2025, Revvity discontinued perpetual licenses for ChemDraw, moving to subscription-only pricing. In January 2026, Revvity completed its acquisition of ACD/Labs and sunset ACD/ChemSketch. These changes have left many researchers re-evaluating their tools.

Meanwhile, open-source momentum is growing. Ketcher (maintained by EPAM) provides a free web-native editor, and RDKit continues to expand as the computational chemistry backbone used by both commercial and academic tools. ChemStitch builds on this open-source foundation, combining Ketcher’s editor with an AI-powered analysis layer.

Which tool fits your workflow?

ChemStitch

Best for researchers who want AI-powered structure analysis in their editor. Free beta. Browser-based.

ChemDraw

Best for teams already invested in the Revvity/Signals ecosystem. Industry standard with the most file format support.

ChemDoodle

Best for chemists who need affordable desktop software with strong IUPAC naming and stereochemistry.

Ketcher

Best for developers and open-source advocates who need a free, embeddable web editor.

MarvinSketch

Best for academic users who need free access with Java-based desktop software.

Feature comparison

ChemStitch

Best for researchers who want AI-powered structure analysis in their editor. Free beta. Browser-based.

  • Free (beta)Price (individual/mo)
  • ✓AI chat & analysis
  • ✓Property prediction (RDKit-computed, deterministic)
  • ✓Retrosynthesis (AI-suggested routes)
  • ✓Structure OCR (AI vision extraction with RDKit validation)
  • ✓PubChem integration (Search by name, CAS, or formula)
  • ✓Batch analysis (Up to 500 molecules via SDF)
  • ✓IUPAC naming (OPSIN backend)
  • ✓Web-native
  • 7+File formats (SMILES, MOL V2000/V3000, SDF, InChI, CDXML, RXN)
  • ✓Publication presets (ACS Document 1996)
  • ✓Reaction schemes (Reaction mode with RXN export)

ChemDraw

Best for teams already invested in the Revvity/Signals ecosystem. Industry standard with the most file format support.

  • $25–170+Price (individual/mo)
  • ✗AI chat & analysis
  • ✓Property prediction (Built-in ChemDraw properties)
  • ~Retrosynthesis (Template-based retrosynthesis)
  • ✗Structure OCR
  • ~PubChem integration (SciFinder integration (separate license))
  • ✗Batch analysis
  • ✓IUPAC naming (Built-in)
  • ~Web-native (Signals Notebook is web-based)
  • 15+File formats (CDX, MOL, SDF, SMILES, InChI, RXN, and proprietary formats)
  • ✓Publication presets (Multiple journal presets)
  • ✓Reaction schemes (Full reaction toolkit)

ChemDoodle

Best for chemists who need affordable desktop software with strong IUPAC naming and stereochemistry.

  • $29Price (individual/mo)
  • ✗AI chat & analysis
  • ✓Property prediction (Built-in property calculator)
  • ✗Retrosynthesis
  • ~Structure OCR (Desktop only, limited format support)
  • ✗PubChem integration
  • ✗Batch analysis
  • ✓IUPAC naming (Built-in)
  • ✗Web-native
  • 10+File formats (MOL, SDF, SMILES, InChI, CML, and more)
  • ✓Publication presets (Multiple journal presets)
  • ✓Reaction schemes (Full reaction toolkit)

Ketcher

Best for developers and open-source advocates who need a free, embeddable web editor.

  • FreePrice (individual/mo)
  • ✗AI chat & analysis
  • ✗Property prediction
  • ✗Retrosynthesis
  • ✗Structure OCR
  • ✗PubChem integration
  • ✗Batch analysis
  • ✗IUPAC naming
  • ✓Web-native
  • 5+File formats (MOL, SMILES, InChI, RXN, KET)
  • ✗Publication presets
  • ~Reaction schemes (Basic arrow tools)

MarvinSketch

Best for academic users who need free access with Java-based desktop software.

  • Free (academic)Price (individual/mo)
  • ✗AI chat & analysis
  • ~Property prediction (Limited property set)
  • ✗Retrosynthesis
  • ✗Structure OCR
  • ✗PubChem integration
  • ✗Batch analysis
  • ✓IUPAC naming (Built-in)
  • ✗Web-native (Java-based desktop)
  • 10+File formats (MOL, SDF, SMILES, InChI, MRV, and more)
  • ~Publication presets (Basic export options)
  • ✓Reaction schemes (Full reaction toolkit)

What the numbers mean

AI chat & analysis

ChemStitch is the only structure editor with a conversational AI built in. Ask questions about your molecule—properties, reactions, retrosynthesis, naming—directly alongside the canvas.

Property prediction

Property prediction quality varies. ChemStitch uses RDKit for deterministic computed properties (MW, logP, TPSA, etc.) with explicit confidence labels. ChemDraw and ChemDoodle have their own built-in calculators with broader property sets.

Retrosynthesis

ChemStitch generates retrosynthesis suggestions using AI, offering creative route proposals that template-based approaches may miss. ChemDraw’s retrosynthesis is rule-based, which can be more predictable for well-known reactions.

Structure OCR

Upload an image of a chemical structure and ChemStitch extracts the SMILES representation using AI vision, then validates it through RDKit before presenting it to you. ChemDoodle offers basic OCR in its desktop version.

PubChem integration

ChemStitch integrates PubChem compound lookup and similarity search directly into the AI chat. ChemDraw connects to SciFinder, which requires a separate institutional license.

Batch analysis

Import a multi-molecule SDF file and compute properties across all structures in one step, with sortable results and enriched SDF export. No other editor in this comparison offers batch property prediction.

IUPAC naming

All editors except Ketcher support structure-to-name conversion. ChemStitch uses the open-source OPSIN library. ChemDraw and ChemDoodle have proprietary naming engines with broader coverage for complex structures.

Web-native

ChemStitch and Ketcher run entirely in the browser with no installation. ChemDraw is primarily a desktop application, though Revvity offers Signals Notebook as a web-based ELN with some drawing capabilities. ChemDoodle and MarvinSketch are desktop applications.

File formats

ChemDraw leads in format support, especially for proprietary formats like CDX. ChemStitch supports 7+ formats including CDXML import (ChemDraw’s XML format), making migration straightforward. Some ChemDraw-specific properties may display differently after import.

Publication presets

ChemStitch offers ACS Document 1996 preset with configurable bond width, font size, and DPI for publication-quality SVG and PNG export. ChemDraw and ChemDoodle offer multiple journal-specific presets—an area where they have more options.

Reaction schemes

ChemStitch supports reaction mode with arrow tools and RXN format export. ChemDraw, ChemDoodle, and MarvinSketch have more mature reaction editors with richer annotation options.

ChemStitch might not be for you if...

  • •You need 3D structure visualization or conformer analysis.
  • •You need NMR or mass spectrum simulation alongside your structures.
  • •You need 15+ file formats including proprietary ChemDraw CDX export—ChemStitch imports CDXML but does not export it.
  • •You need a desktop native application (ChemStitch is web-only by design).
  • •You need real-time collaboration with multiple editors on the same canvas.
  • •You need ELN integration or GxP compliance for regulated environments.
  • •You work primarily on mobile or tablet—ChemStitch supports desktop browsers only.

Ready to try ChemStitch?

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Competitor details are best-effort estimates and may change. Contact us at support@chemstitch.ai with corrections.