ChemEx: NMR Chemical Exchange Analysis Tool
Table of Contents
About ChemEx
ChemEx is an advanced, open-source software specifically designed for analyzing NMR experimental data to characterize chemical exchange processes. Ideal for researchers and scientists in the field of biochemistry and molecular biology, ChemEx aids in the analysis of NMR experiments like Carr-Purcell-Meiboom-Gill (CPMG) relaxation dispersion and Chemical Exchange Saturation Transfer (CEST).
Prerequisites
ChemEx requires Python 3.13 or later. When a requested ChemEx release needs a newer Python, uv can use a compatible installed interpreter or download a managed one when automatic Python downloads are enabled (the default).
Installation
PyPI is the authoritative Python package distribution for ChemEx.
Recommended installation
uv installs ChemEx as an application in an isolated environment. On macOS, install uv with Homebrew:
brew install uv
On Linux or Windows, follow Astral's current uv installation instructions.
Then install ChemEx from PyPI and verify that it starts:
uv tool install chemex@latest
chemex --version
Requesting @latest prevents uv from selecting an older ChemEx release to match
an outdated Python interpreter.
Try ChemEx without installing it
uvx chemex@latest --help
Updating ChemEx
Update an unpinned tool installation with:
uv tool upgrade chemex
Reproducible, version-pinned installation
To install a specific release:
uv tool install "chemex==2026.09.2"
Alternative: pip
If you need conventional Python tooling, use Python 3.13 or later to install ChemEx from PyPI inside a virtual environment:
python -m venv .venv
source .venv/bin/activate # On Windows: .venv\Scripts\activate
python -m pip install chemex
Conda packages
The historical conda-forge package is no longer maintained by the ChemEx project and may be outdated. Install the current PyPI release with uv or pip.
Contributing
We encourage contributions from the community. Please see our CONTRIBUTING.md for guidelines on how to make ChemEx better. For any issues or suggestions, please open an issue or a discussion on our GitHub repository.
Support and Documentation
For additional support, tutorials, and detailed documentation, visit the ChemEx Documentation.
License
ChemEx is licensed under the GPL-3.0. See the LICENSE file for more details.
Developed with ❤️ by the ChemEx Contributors
1 maintainer
Metadata
1 maintainer
Release files for chemex 2026.9.2
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| chemex-2026.9.2.tar.gz | 437.9 kB | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| chemex-2026.9.2-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 1.0 MB
Release files / chemex-2026.9.2.tar.gz
| Download URL | chemex-2026.9.2.tar.gz |
|---|---|
| Size | 437.9 kB |
| Tags | Source |
|
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Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
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Provenance
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PyPI Publish Attestation
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Signed by GitHub Actions, verified by PyPI on Sep 23, 2026.
Transparency logRelease files / chemex-2026.9.2-py3-none-any.whl
| Download URL | chemex-2026.9.2-py3-none-any.whl |
|---|---|
| Size | 572.8 kB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
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BLAKE2b-256 checksum How to use checksums |
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|
| 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 23, 2026.
Transparency log
