mrge

cubic is an AI code review tool for complex codebases, and the official claim is that it ranks first in all independent benchmarks. It is designed to help teams merge code faster while improving review quality.

Purpose cubic is mainly used to find hard-to-spot defects in Pull Requests (PRs) and to continuously scan the entire codebase. It is suitable for teams that cannot afford defects, especially engineering teams that need to handle a large number of PRs and have high requirements for code quality and security.

Main capabilities

• Real-time inline feedback: every PR gets inline comments within seconds.
• Context beyond the diff: it not only checks the change itself, but also flags changes that break code elsewhere, even across repositories.
• Learn senior engineer rules: turn senior engineers' past review comments into rules and run them on every PR.
• Natural language rules: write rules in everyday language, and cubic checks them on every PR.
• Automatically approve low-risk PRs: safe changes are automatically approved, while risky changes are still left to humans.
• Merge confidence score: every PR gets a safe-to-merge score from 1 to 5.
• Integration with coding agents: Claude Code, Codex, and Cursor can receive cubic's comments and fix issues.
• Run in the terminal: run cubic in the terminal before pushing to fix issues in advance.
• Nightly codebase scan: run thousands of AI agents every night to find and fix serious defects and security vulnerabilities.
• AI triage: automatically notify issue owners and create tickets, fix with one click, and automatically resolve tickets after the fix is merged.
• Scheduled or pre-release scans: run scans on a schedule, or before major releases.
• Two-way GitHub sync: comments and reviews appear in sync in GitHub and cubic.
• Reading order changes: related changes are grouped and ordered logically rather than alphabetically.
• Change overview map: understand the changes through a diagram before reading the code.
• Ask the PR: ask questions or get a guided walkthrough of the PR.
• Review inbox: all PRs waiting for you are gathered in one place.
• Desktop app: supports macOS, Windows, and Linux.

How to use

• Installation: the official claim is "2-click installation," and you can try it for free without a credit card.
• Use in GitHub: review directly in GitHub.
• Review in cubic: change github.com in any PR link to cubic.dev can be opened in cubic.
• Download the desktop app: the official desktop app download is provided.
• Run in the terminal: run cubic in the terminal to fix issues before opening a PR.
• Connect public repositories: cubic is free for public repositories, and AI review is available once connected.

Use cases

• Teams that need to quickly review a large number of PRs.
• Projects with complex codebases where cross-file or cross-repository impacts are difficult to find manually.
• Teams that want to codify senior engineers' review experience into rules.
• Teams that need full-codebase defect and security scans at night or before release.
• Teams using coding agents such as Claude Code, Codex, and Cursor.
• Teams with security and privacy requirements that need SOC 2 compliance.

Limitations and notes

• The official statement says that after AI reviews code in real time, all content is cleared, and the code is not stored or used to train AI.
• All mainstream programming languages are supported, including JavaScript, TypeScript, Python, Go, Ruby, Java, and C#.
• Billing is calculated by "lines reviewed": added and deleted lines in a PR; generated files, third-party code, binary files, and ignored files are not counted, and incremental reviews count only new changes.
• After exceeding the plan's line count, reviews pause until the next billing cycle; administrators can enable elastic capacity, with additional lines charged at $20 per 10,000 lines, charged only when needed, and with a monthly cap.
• Seat rules: the Team plan allows choosing seats; in the Pro and Max plans, developers who open 15 or more PRs within 30 days need a seat because scans cover the entire repository, and bots are not counted.
• Usage resets with the billing cycle.
• The official offering includes a free plan (20 PR reviews per month as a trial), Team, Pro, Max, and Enterprise plans; specific prices are not yet provided.
• The official statement says there is an open-source program: public repositories are free.
• Specific installation commands, code examples, and detailed pricing are not yet provided.