Flit review
A focused open-source choice for straightforward Python package builds and publishing.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Flit is an open-source Python packaging tool for developers who distribute pure-Python modules and packages. It initializes project metadata with `flit init`, builds wheels and source distributions, installs packages locally for development, and publishes releases to PyPI or other configured package indexes. Its focused workflow suits developers who want package building and publishing without adopting a broader project-management tool. Flit supports Linux and Windows, and its open-source model makes the core tool available without a paid tier.
The packaging workflow covers several practical steps. Project metadata lives in `pyproject.toml`, while optional dependency groups can be defined there as well. Flit automatically includes subpackages and package data, which keeps package configuration focused on the project rather than repeated file lists. For development installs, it can use symlinks or `.pth` files. Published packages can target PyPI, TestPyPI, or another configured repository, with pip fitting into the installation workflow.
Flit is most appropriate when the main requirement is a straightforward path from project metadata to build artifacts and publication. Its support for reproducible wheel builds adds value for projects that need consistent build output. The tradeoff is scope: Flit is a packaging and publishing tool, not a full dependency or virtual-environment manager, and it does not provide dependency-resolution features comparable to dedicated project managers. Choose it for focused Python package distribution; consider a broader project manager when dependency resolution or environment management is central to the workflow.
Flit pros and cons
- Where it wins
- Builds wheels and source distributions for Python packages
- Publishes packages to PyPI or another configured repository
- Supports dependency groups and reproducible wheel builds
- Where it doesn't
- Does not resolve dependencies
- Does not manage virtual environments
- Focused on pure-Python modules and packages
Flit fact sheet, pricing and score →
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