Sourcery Freemium

Sourcery reviews your Python and JavaScript code and suggests refactors it can often apply automatically. It runs as an IDE extension, a CLI in CI, and a GitHub review bot. There is a free tier for open source and solo use, with paid team plans.

What sets Sourcery apart from other review bots?

Actionable fixes. Most linters tell you a function is too complex. Sourcery shows a rewritten version — collapsing nested conditionals, converting a loop to a comprehension, replacing a manual counter with enumerate — and you accept it with one click in the IDE.

It started as a Python refactoring engine and later added LLM-based PR review. That history matters: the deterministic rules are its foundation, and the AI layer sits on top rather than replacing it.

Product Features

• Refactoring suggestions in Python, JavaScript and TypeScript, with one-click apply in VS Code, PyCharm and Neovim.
• PR review bot that summarizes a diff and leaves line-level comments.
• Configurable rules via a .sourcery.yaml file, so you can mute categories your team disagrees with.
• Test generation that drafts unit tests for a function or class.
• Security scanning for common injection and secret-leak patterns.
• Pre-commit and CI modes for running checks on every push.

Product Highlights

The IDE experience is the strong suit. Suggestions appear as you type, before the code ever reaches a PR, which is where refactoring is cheapest. Python support is deeper than the JS support — Python is where the tool cut its teeth.

Be aware of the noise problem. On a legacy codebase, Sourcery can flag hundreds of items on day one. Teams usually need to phase adoption or they will tune it out entirely. Its AI PR summary is also thinner than dedicated reviewers like Graphite or CodeRabbit.

Pricing: free for open-source repositories, and paid plans around $10–15 per developer per month for private repos with team features. That is cheaper than most AI reviewers, which reflects its narrower scope.

Use Cases

• Python teams standardizing style without a heavy linter config.
• Junior developers learning idiomatic refactors from suggestions.
• Cleaning up a legacy module before adding features.
• Adding a lightweight review check to CI on a budget.
• Generating first-draft unit tests for untested functions.

Quick Summary

• Sourcery is a refactoring-focused code review tool, strongest on Python.
• It suggests concrete code changes and applies them with one click in the IDE.
• Free for open source; paid plans run roughly $10–15 per developer monthly.
• Also supports JavaScript and TypeScript, but with shallower coverage.
• Noisy on legacy code — plan a phased rollout.