Shards vs uv
Shards
crystal-lang.org
uv
docs.astral.shSide by side
| Figure | Shards | uv |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| Android | Yes | — |
| Plans published | 1 | 1 |
| Spec score · Package Managers | 8.1 (#34) | 8.9 (#4) |
| Maker | The website says the Crystal language was born and raised at Manas.Tech. | Astral says its mission is to make the Python ecosystem more productive by building high-performance developer tools, starting with Ruff. |
| Purpose | Shards is Crystal’s dependency manager for managing dependencies for Crystal projects and libraries. | uv is an extremely fast Python package and project manager written in Rust. |
| Supported platforms | The install page lists Linux, macOS, and Windows, and lists Android installation through community-maintained Termux packages. | macOS,Linux,Windows,CPython,PyPy,Pyodide,GraalPy |
Plans
In their own words
uv
uv is a Python package and project manager for Linux, macOS, and Windows. Written in Rust, it manages dependencies and environments, with lockfiles and workspaces, and can install, list, pin, or uninstall Python versions. It also runs scripts with dependencies and runs or installs command-line tools from Python packages. Its pip-compatible interface is intended to cover work done by tools such as pip, pip-tools, pipx, poetry, pyenv, twine, and virtualenv, though its commands do not exactly match those tools. The documentation describes uv as 10–100x faster than pip. It supports source distributions, wheels, requirements.txt, and pylock.toml, as well as offline installation and private registry authentication. For package selection, its default first-index strategy limits candidates to the first index where a package is found. Credentials are not stored in uv.lock, but uv currently stores them in a plaintext file; native system secret storage is an experimental preview. The free plan is free.