Sourcery

Sourcery is an AI code-review and code-quality tool with deep Python support (200+ built-in rules) plus custom rules, offering instant PR reviews and real-time feedback inside VS Code, Cursor, and JetBrains IDEs. It is SOC 2 certified with zero-retention and bring-your-own-LLM options and integrates with Sentry. It is a smaller, focused player especially strong for Python-heavy teams.

Sourcery began as an AI code-quality and refactoring assistant with especially deep Python support (200+ built-in rules) and grew into a broader AI code reviewer. It offers instant pull-request reviews with summaries, change diagrams, and line-by-line feedback, plus real-time review inside VS Code, Cursor, and JetBrains IDEs, so developers get guidance as they write rather than only at PR time. Beyond its Python roots it supports JavaScript and custom rules via a .sourcery.yaml config, and it emphasizes security and privacy with SOC 2 certification, a zero-retention option, and bring-your-own-LLM support. It integrates with Sentry for production-issue monitoring and is used by a large developer base including some well-known companies. Sourcery is a strong fit for Python-heavy teams that want both in-editor quality feedback and PR review from one tool. Its rule depth outside Python is more limited, so teams in other language ecosystems should evaluate coverage for their stack. Founded in London and seed-funded, it is a smaller, focused player rather than one of the heavily capitalized market leaders.