uv
Ultra-fast Rust-based Python package and project manager that replaces pip, pip-tools, virtualenv, and pyenv with a single tool running 10-100x faster.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Verifies package hashes by default; supports hash-pinned requirements; no network auth surface; supply chain security via SHA-256 hash verification in lock files
⚡ Reliability
Best When
You want the fastest Python dependency resolution and installation with minimal configuration, especially in CI/CD pipelines.
Avoid When
Your project depends heavily on conda channels for native binaries like CUDA or geospatial libraries — use pixi instead.
Use Cases
- • Install Python packages 10-100x faster than pip using parallel downloads and a global cache
- • Manage multiple Python versions without pyenv using `uv python install`
- • Create and manage isolated virtual environments with `uv venv`
- • Lock and reproduce exact dependency trees with `uv lock` and `uv sync`
- • Run scripts with inline dependency declarations using `uv run` without pre-installing packages
Not For
- • Conda-based or non-PyPI native/binary dependency management (C++, CUDA, R packages)
- • Publishing packages to PyPI (uv supports building but publishing is limited vs. poetry/twine)
- • Teams standardized on conda/mamba who need cross-language package management
Interface
Authentication
CLI tool with no auth; private indexes configured via UV_INDEX env vars or pyproject.toml with optional HTTP basic auth
Pricing
MIT/Apache-2.0 licensed; backed by Astral with no commercial licensing
Agent Metadata
Known Gotchas
- ⚠ UV_SYSTEM_PYTHON or --system flag required to install into system Python; agents often miss this
- ⚠ `uv run` creates ephemeral envs by default — agent must check if persistent venv is needed
- ⚠ Lock file (uv.lock) must be committed for reproducible agent-driven installs; easy to omit
- ⚠ Private index credentials must be set via env vars or netrc; agents may expose secrets in args
- ⚠ uv does not activate virtualenvs in the shell — agent scripts must use `uv run` or explicit venv paths
Alternatives
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Scores are editorial opinions as of 2026-03-07.