cubic

cubic is an AI code review tool that reviews GitHub pull requests against your whole codebase and your team's own rules for engineering teams that merge a lot of code. Many review bots look only at the diff; cubic's pitch is context, catching changes that quietly break something in another file or another repository. It also tries to cut the time between a comment and a fix by handing its findings directly to coding agents.

What is cubic used for?

Teams use cubic as a first reviewer on every PR, so human reviewers spend their time on design questions instead of missed null checks. It also works earlier in the loop through a CLI and later through scheduled scans.

• Leaving inline review comments on each pull request, including cross-repository breakage
• Enforcing team rules written in plain English or learned from senior engineers' past review comments
• Scoring each PR's merge safety from 1 to 5 and auto-approving low-risk changes
• Writing PR descriptions automatically
• Passing review comments to Claude Code, Codex or Cursor so an agent applies the fix
• Running scheduled codebase scans that find bugs and security issues and open tickets for their owners

Who cubic is best for

cubic suits startups and mid-size engineering teams on GitHub that ship many PRs a day, especially teams already using AI coding agents and seeing review become the bottleneck. Open-source maintainers can use it free on public repositories. Teams on GitLab or Bitbucket should confirm support first, since the site only describes GitHub, and solo developers with a handful of PRs a month may be fine on the free Starter plan or a lighter tool.

cubic pricing

As of October 2026, cubic offers a free Starter plan with 20 PR reviews a month and free use on public repositories. Paid plans are billed per developer: Team is $30 per month billed yearly ($40 month to month) with 40,000 reviewed lines, auto-fix and five custom review agents; Pro is $79 per month billed yearly ($99 monthly) and adds codebase scans for three repositories, more custom agents, Confluence and MCP integrations, and an API; Max is $160 per month billed yearly ($200 monthly) with the highest line and auto-fix limits. Paid plans come with a 7-day trial. Every plan includes AI PR reviews, automatic PR descriptions and custom context.

Limitations to keep in mind

• Per-developer pricing adds up quickly for larger teams compared with flat-rate tools
• Reviewed-line caps apply on each paid tier
• The site only documents GitHub integration
• Benchmark claims on the site are the vendor's own, so test it on your real PRs

cubic vs alternatives

CodeRabbit is the most widely used AI PR reviewer and supports more Git hosts, so it is the safer choice for GitLab or Azure DevOps shops. Greptile also leans on full-codebase context and is a close head-to-head comparison worth trialing side by side. Graphite is a better fit if you want stacked PRs and a faster review workflow, with AI review as one part of it. Qodo is broader, covering test generation and IDE help as well as review. Pick cubic when learned team rules, merge scoring and agent hand-off are what you want from a reviewer.

Tips for getting started with cubic

Install it on one active repository first and leave it in comment-only mode for a week before enabling auto-approval. Seed the rules with a few plain-English conventions your team actually argues about, such as error handling or logging. Try the trick of replacing github.com with cubic.dev in a PR link to open the review view. Once you trust the comments, connect your coding agent so fixes arrive as commits rather than to-do items.

cubic FAQ

Is cubic free?

Yes, cubic has a free Starter plan with 20 PR reviews a month and is free for public repositories. Paid plans start at $30 per developer per month billed yearly.

Does cubic work with GitLab?

cubic's website only describes GitHub integration, with two-way comment sync, so GitLab teams should confirm support with cubic before buying.

Can cubic fix the issues it finds?

Yes. Paid plans include auto-fix for review issues and CI failures, and cubic can pass comments to coding agents such as Claude Code, Codex and Cursor.

What is the best alternative to cubic?

CodeRabbit is the most common alternative for AI pull request reviews, and Greptile is a close match for codebase-aware reviews.