uv
Extremely fast Python package manager and project tool written in Rust by Astral (ruff creators). Drop-in pip replacement with 10-100x faster install times. Handles virtual environments, Python version management, dependency locking (uv.lock), and project scaffolding. Consolidates pip, pip-tools, pipx, pyenv, and virtualenv into one tool.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Download verification via hash checking. Verifies package integrity. Credential management via environment variables or keyring — avoid hardcoding in scripts.
⚡ Reliability
Best When
New Python projects or any context where pip speed is a bottleneck — CI/CD, Docker builds, development setup.
Avoid When
Complex conda environments with binary scientific packages or Poetry-specific publishing workflows.
Use Cases
- • Replace pip with 10-100x faster package installation: uv pip install requests instead of pip install requests
- • Manage Python project dependencies with lock files: uv add, uv lock, uv sync for reproducible environments
- • Install and run Python CLI tools in isolation: uv tool install ruff replaces pipx
- • Manage multiple Python versions: uv python install 3.12 and uv python pin 3.12
- • Bootstrap Python projects: uv init --app myproject creates project structure with pyproject.toml and virtual env
Not For
- • Conda environments or scientific Python stacks with complex C dependencies — conda/mamba handle binary packages better
- • Poetry-specific workflow features (publishing, version management) — uv focuses on installation, not publishing (yet)
- • Projects requiring exact pip behavior — uv has minor compatibility differences; test before migrating critical projects
Interface
Authentication
CLI tool — configures PyPI credentials via UV_PUBLISH_TOKEN or uv publish. Package installation auth via .netrc or keyring.
Pricing
Open source tool from Astral. Free forever. Astral is funded by VC but uv remains open source.
Agent Metadata
Known Gotchas
- ⚠ uv is rapidly evolving — features like uv run, uv tool, and uv python were added in 2024; check docs for your version's available commands
- ⚠ uv.lock format is different from poetry.lock and pip-compile requirements — not interchangeable between tools
- ⚠ uv sync installs exact locked versions — running uv add changes the lock file; don't mix uv add and manual pyproject.toml edits
- ⚠ Python version management with uv python requires separate download — uv python install 3.12 downloads Python; uv does not use system Python by default
- ⚠ uv pip install is a compatibility layer but not 100% pip-compatible — some pip flags and behaviors differ; test thoroughly before replacing pip in scripts
- ⚠ CI cache optimization: cache the ~/.cache/uv directory for warm uv pip install runs; the cache is compatible across machines using the same platform
Alternatives
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Scores are editorial opinions as of 2026-03-06.