tox

tox is a generic virtualenv management and test command line tool

tox Permissive license MIT Active ★ 3,920 v4.59.0 released 2026-08-10

Install

tox on PyPI

pip

pip install tox

uv

uv add tox

poetry

poetry add tox

Package facts

License	MIT (permissive)
Python support	supports the current Python release (>=3.10)
Install friction	low — pure-Python wheel
Runtime dependencies	12 — cachetools, colorama, filelock, packaging, platformdirs, pluggy, pyproject-api, python-discovery, tomli-w, tomli, typing-extensions, virtualenv
Maintenance	actively maintained — 3 days since the last release
Last repo commit	2026-08-12
First released	2010-07-12
Popularity	one of the top 1,000 most-downloaded packages on PyPI (30-day window, as of 2026-08-13)
Known vulnerabilities	none known (OSV.dev, checked 2026-08-13)

Evidence: tox-4.59.0-py3-none-any.whl

Keywords: environments, isolated, testing, virtual

Development Status :: 5 - Production/StableFramework :: toxIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseOperating System :: MacOS :: MacOS XOperating System :: Microsoft :: WindowsOperating System :: POSIXProgramming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: 3.15Topic :: Software Development :: LibrariesTopic :: Software Development :: TestingTopic :: Utilities

About tox

from the package's own PyPI description — quoted content, verbatim

tox

PyPI (image) Supported Python versions (image) Downloads (image) Documentation status (image) check (image)

tox aims to automate and standardize testing in Python. It is part of a larger vision of easing the packaging, testing and release process of Python software (alongside pytest and devpi).

tox is a generic virtual environment management and test command line tool you can use for:

checking your package builds and installs correctly under different environments (such as different Python implementations, versions or installation dependencies),
running your tests in each of the environments with the test tool of choice,
acting as a frontend to continuous...

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AI interpretation — verify before relying

AI-generated interpretation of the package facts above; every digit, version, license, or vulnerability id it cites is grounded in the facts already shown on this page

tox automates and standardizes testing across multiple Python environments, managing virtual environments and running test suites with different Python versions, implementations, and dependencies in isolation.

Low install friction with a pure-wheel distribution and 12 well-established runtime dependencies. Active maintenance with a release 3 days ago and continuous commits through 2026-08-12 signal ongoing support.

MIT license (permissive) allows free use, modification, and distribution with minimal restrictions, making it suitable for both open-source and commercial projects.

Usage

pip install tox
tox --version
# Create a tox.ini file, then run: tox

Requires Python >=3.10; tox creates and manages isolated virtual environments, so a working Python installation and pip are prerequisites.

Verdict: tox is a mature, actively maintained testing automation tool (Production/Stable, 3920 GitHub stars, top 1000 PyPI) with permissive MIT licensing, low install friction, and no known vulnerabilities. It is well-suited for standardizing test workflows across Python versions and environments.

Needs verification

Whether the 12 runtime dependencies introduce any transitive security concerns or maintenance risks not captured in the OSV scan.
Performance characteristics when managing many concurrent test environments or large dependency trees.

python testing automationvirtual environment managementmulti-environment test runnerpython version testingci testing frameworkisolated test environmentspython test automation tool