N3MO

N3MO is a code review automation tool that analyzes pull requests and tells you exactly which parts of your codebase a change will affect. It parses your repository, maps dependencies across 27 languages, and calculates what the team calls the transitive blast radius of every commit. Instead of relying on unit tests and intuition to catch ripple effects, you get a concrete answer about how a refactor or deletion cascades through service layers.

The core problem it solves is visibility. When you change a function, you know what calls it directly, but you don't always know what calls those callers, or what relies on the behavior three layers deep. Standard code review catches the obvious breaks, but hidden dependencies slip through and show up in production. N3MO traces call chains recursively and posts an impact report to your pull request within seconds, turning that blind spot into a documented checkpoint.

It integrates with GitHub through webhooks. Merge a PR, and the tool comments with a structured breakdown of direct and indirect impacts, flagging anything outside the scope of your tests. For teams working in legacy monoliths, this is where it earns its keep: the parts of the codebase nobody fully understands become legible again, at least in terms of what touches what.

The platform supports 27 languages via GitHub's Tree-sitter parser, with deeper semantic mapping for Python, JavaScript, TypeScript, and Java. There's also an MCP server that plugs into Claude Desktop, Cursor, and Windsurf, giving AI coding agents deterministic structural context instead of guessing at dependencies. A CLI lets you run everything locally with a Docker-based PostgreSQL setup for AST indexing if you'd rather not send code to the cloud.

Pricing is repository-based, not seat-based, so your whole team can use it without per-user fees. Plans start at 19 dollars a month for a single repo up to 30,000 lines of code, scaling to 399 dollars for seven repos and 3.5 million lines. Enterprise customers get unlimited repos, self-hosted deployments, and zero cloud storage of code. There's a 15-day free trial on the Pro tier.

N3MO fits staff engineers managing sprawling monoliths, senior reviewers acting as merge gatekeepers, and autonomous AI agents that need precise dependency data. If your team has ever shipped a change that broke something unexpected because nobody realized the connection, this is the tool that makes those connections explicit before they cost you an incident.