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Chemvas is an open-source chemical drawing application designed for desktop drafting and publication-quality figure preparation. Draw structures and reaction schemes intuitively on the canvas, insert SMILES, align components, and export figures with exact journal dimensions.
Features
- Intuitive Canvas Drawing: Sketch structures, insert SMILES, label reaction arrows, and align molecules with real-time feedback, autosave, and session recovery.
- Publication-Ready Figure Export: Export vector graphics (SVG, PDF) and raster images (PNG, TIFF) at exact publication column widths (e.g., 82 mm, 174 mm) while retaining full canvas editability.
- Chemistry & 3D Preview: Inspect molecular properties, view interactive 3D conformations, and export XYZ coordinates with optional RDKit integration.
- Reliable Document Format: Saved
.chemvasdocuments remain fully editable JSON files (version 8, schema 1). See our document compatibility policy.
Install
Requires Python 3.12+.
To use chemical informatics features (SMILES insertion, molecular properties, 3D XYZ export, and structure suggestions), install with the optional RDKit backend:
pip install "chemvas[rdkit]"
chemvas
For basic drawing, document editing, and figure export without RDKit:
pip install chemvas
For local Windows packaging, see the Windows packaging guide.
Quickstart: Your First Reaction Scheme
- Type
OCc1ccccc1in the SMILES field below the toolbar, click Insert, then click on the canvas. Hover over the oxygen atom, press Enter, and set the label toOH. - Insert
O=Cc1ccccc1to the right. Select the Arrow tool, drag between the structures, and double-click the arrow to add condition labels. - Select both molecules (Edit ▸ Select All) and align them (Edit ▸ Align ▸ Middle).
- Save the document (
.chemvas). Export via File ▸ Export Figure… → Plain SVG, Fit 2-column (174 mm).
For detailed instructions and example files, see the step-by-step guide.
Documentation
- Drawing Tools & Shortcuts · Chemistry I/O · Image Objects
- Calculation Handoff (RDKit): Export reaction steps with embedded components to
machine.json. - Headless & Agent CLI · Scheme Layout · Publication Schemes
- Examples: Sample
.chemvasdocuments (version 8, schema 1). - Architecture · Contributing · Changelog · Releasing · License (MIT)
Feedback and bug reports: GitHub Issues.
1 maintainer
Release files for chemvas 0.19.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| chemvas-0.19.0.tar.gz | 715.3 kB | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| chemvas-0.19.0-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 1.6 MB
Release files / chemvas-0.19.0.tar.gz
| Download URL | chemvas-0.19.0.tar.gz |
|---|---|
| Size | 715.3 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
976c5ce56593dec529990f4225addd7865cb27d964e0ee7fa6746fbe1b538fae
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BLAKE2b-256 checksum How to use checksums |
230f7b759ba06dcc3856518bd16336b713630eaf7f22bc9e5867045794853170
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Sep 24, 2026.
Transparency logRelease files / chemvas-0.19.0-py3-none-any.whl
| Download URL | chemvas-0.19.0-py3-none-any.whl |
|---|---|
| Size | 890.1 kB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
be8d343a61e8e5539dc2598b334e152cc8a80ab42b3ec05b8cf93d1c001b2584
|
|
BLAKE2b-256 checksum How to use checksums |
86f2418e248d7a8d387de2cb0f606ca6310889b952fa74a59410137c907618bc
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Sep 24, 2026.
Transparency log
