15-Day Free Trial Available

Automated PR Review — Know What Breaks Before You Push

N3MO is a code review automation tool that parses your repository's ASTs and builds a call graph to trace the transitive blast radius of any pull request change instantly.

Benchmark: Indexed TensorFlow in 14.06 minutes (14,611 files, 79,523 symbols, 480,851 edges)

Get Started for Free Star on GitHub

n3mo interactive playground

Query Symbol

Blast Radius Info

Affected Files: 3

Transitive Callers: 8

Severity: High Impact

auth_user

refresh

validate

POST /login

admin_login

require_auth

Powerful Features for Automated Code Review

Stop guessing what your pull requests will break. N3MO builds a relational knowledge graph of your codebase to empower engineering teams with precise impact analysis.

Transitive Blast Radius

Traces call links recursively to arbitrary depth, showing you direct and indirect downstream impacts of any refactor or deletion. Find hidden dependencies that standard search tools miss.

Root: auth.py Transitive Depth: 5 DB Resolution: Scope-Aware

SELECT symbol, file_path FROM callers WHERE target = 'db_pool';
> Found 12 matching transitive callers across 4 service layers.

27 Languages*

Powered by GitHub's Tree-sitter. We parse Python, TS/JS, Java, Go, Rust, C++, Ruby, PHP, and more locally.

*Tree-sitter parsing supported for 27 languages. Deep semantic call graph mapping currently optimized for Python, JS/TS, and Java.

Python TypeScript Java

Native MCP Server

Integrate N3MO directly into Cursor, Claude Desktop, or Windsurf. Allow AI agents to trace structures without hallucinations.

Model Context Protocol Active

GitHub Webhook

Enforce codebase size-aware checkpoints on every Pull Request, posting a comprehensive impact markdown report directly to PR comments in under 2 seconds.

github-actions bot commented on PR #124

◈ N3MO Impact Check: PASSED
• Modifying auth_user affects 3 downstream components.
• Transitive blast radius: High Impact (8 caller nodes).

Who is N3MO Built For?

A concise breakdown of our ideal user profiles.

Staff Engineers

Architects managing large, legacy monoliths who need a reliable way to map sprawling dependencies before initiating major refactors.

Code Reviewers

Senior developers acting as gatekeepers on PRs who want automated, mathematically-proven impact analysis instead of relying entirely on unit tests.

AI Code Agents

Autonomous coding bots like Claude and Cursor that require a precise, deterministic knowledge graph to avoid hallucinating file structures.

How It Works: A Practical Scenario

Step-by-step instructions on catching breaking changes.

Install the GitHub Webhook

Navigate to your repository settings and grant N3MO read access to your source code. You don't need to configure CI/CD pipelines or write custom workflows.

Open a Pull Request

A junior developer opens a PR modifying a seemingly isolated utility function, `format_date()`. Unbeknownst to them, this function is indirectly used by the core billing service.

Review the Impact Report

Within 2 seconds, N3MO intercepts the webhook, parses the entire AST, and posts a comment on the PR detailing the exact downstream services that depend on `format_date()`. You catch the breaking change before it hits production.

Native MCP Server Integration

Give AI agents like Cursor and Claude deterministic structural context instead of random file chunks.

Claude Desktop

Automatically configure N3MO as an MCP tool for Claude to map blast radius before it writes code.

$ cd /path/to/project
$ n3mo mcp install

Cursor IDE

Add N3MO directly to Cursor settings to enable instant transitive impact queries during refactoring.

Go to Settings -> Models -> MCP
Type: command
Command: n3mo mcp start

Plans & Pricing

Scale N3MO's PR impact check capabilities dynamically to fit the size of your team's codebases.

No seat-based pricing. Ever.

N3MO prices by repositories, not users, so your entire engineering team can collaborate without buying additional licenses. Each repository receives continuous indexing, dependency analysis, PR impact detection, and code intelligence. Start free with local MCP — upgrade only when you want automated PR checks across your team.

Standard Plan

$19/month

For solo devs and small projects

Up to 1 repo
30,000 LOC per repo
30,000* max total LOC
Real-time PR Impact Analysis
Interactive Dependency Graph
Community support

Popular

Pro Plan

$69/month

For small teams (2–5 devs)

Includes 15-Day Free Trial

Up to 3 repos
100,000 LOC per repo
300,000* max total LOC
Everything in Standard Plan
Multi-repo dashboard
Email & community support

Team Basic

$199/month

For growing teams (6–20 devs)

Up to 5 repos
200,000 LOC per repo
1,000,000* max total LOC
Everything in Pro
Slack notifications & RBAC
Priority SLA support

Team Pro

$399/month

For advanced engineering teams

Up to 7 repos
500,000 LOC per repo
3,500,000* max total LOC
Everything in Team Basic
Custom webhooks
Advanced Org RBAC

Enterprise

Custom

For large orgs (20+ devs)

Unlimited repos
Unlimited LOC
Everything in Team Pro
Self-hosted & Offline JWT
SSO/SAML & Audit logs
Dedicated Success Engineer

*Fair use applies. Repository limits are intended for typical engineering teams. Extremely large monorepos may count against your codebase quota. Contact us for larger deployments.

Works with

GitHub GitLab Bitbucket

Supports

Python Go Java TypeScript Rust C++ C#

Why repositories instead of seats?

Traditional SaaS	N3MO
Pay per developer	Pay per repository
More employees = higher bill	Unlimited teammates
Seat licenses	Repository intelligence
Penalizes team growth	Encourages collaboration

Frequently Asked Questions

What counts as a repository?

Any GitHub repository that you connect to N3MO and actively analyze using our webhook integrations.

Can I invite unlimited teammates?

Yes! Once a repository is indexed, anyone on your team can view PR impact reports and use the interactive graph without needing their own license.

What is a monorepo?

A single repository containing multiple distinct projects or services. Monorepo support on the Team plan ensures we index all nested dependencies properly.

What happens if I exceed the limit?

You'll get a heads-up before any repo stops syncing, with a one-click upgrade — no PRs are ever silently blocked without warning.

Local CLI Reference

N3MO is fully functional locally right from your terminal.

1. Installation

Install the N3MO CLI package directly from PyPI.

pip install n3mo

2. Setup Database & Crawler

Spin up N3MO's PostgreSQL docker container and verify local variables in one command.

n3mo setup

3. Index the Workspace

Index AST structures and build the relational call links inside Postgres.

n3mo index

4. Run Impact Queries

Trace the impact chain and launch the orbital interactive visualizer in your local browser.

n3mo impact "symbol_name" --graph

n3mo impact output

                            ◈ IMPACT ANALYSIS

                            ──────────────────────────────────────────────────

                            Target: authenticate_user

                            ──────────────────────────────────────────────────

                            ◉ Direct Callers (3 symbols)

                              ▸ login_endpoint
                                       api/auth.py:12

                              ▸ refresh_token
                                        api/token.py:23

                              ▸ validate_session
                                     middleware/auth.py:89

                            ◎ Ripple Effects (5 symbols)

                                ╰─▸ POST /login
                                      routes.py:67

                                ╰─▸ admin_login
                                      admin/views.py:34

                                ╰─▸ require_auth
                                     decorators.py:12

                                ╰─▸ dashboard_view
                                   views/dashboard.py:8

                                ╰─▸ settings_view
                                    views/settings.py:22

                            ──────────────────────────────────────────────────

                            Total impacted: 8 references │ depth ≤ 3

Privacy and Code Governance

We believe code should be analyzed where it lives. N3MO is designed from the ground up to respect security boundaries and data governance rules:

Zero Stored Source Code

For SaaS users, N3MO analyzes code entirely in-memory on highly secure, ephemeral GitHub runners. We extract only the structural graph metadata, and the runner is instantly destroyed. We never store your raw source code.

Zero-Trust Deployments

Enterprise users run the N3MO CLI natively inside their own private, air-gapped CI/CD pipelines. In this mode, your code literally never leaves your Virtual Private Cloud (VPC).

Read the full N3MO Privacy Policy .