Diamond by Graphite
AI code review agent that catches bugs and security issues instantly on GitHub.
Diamond is the rare AI code review tool that actually reduces noise — its <5% negative comment rate proves it. For teams tired of false positives, it's a solid upgrade, though per-user pricing may sting for smaller teams.
Verified 8d ago · liveness 88/100 · cite: rightaichoice.com/tools/diamond-by-graphite
- Engineering teams that ship frequently and want to catch bugs before production
- Teams using GitHub who want AI code review without context switching
- Dev teams aiming to enforce coding best practices via custom rules
- Organizations with large codebases where human review is slow
- Individual developers or very small teams on a tight budget (paid plans start at $20/user/mo)
- Projects that need a free AI code review solution with unlimited reviews (Hobby tier is limited)
- Teams that prefer a standalone tool without GitHub dependency
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Skip Diamond if you need a free code review tool with no per-user limits or if your team uses GitLab or Bitbucket.
Going past limited AI reviews on Hobby or Starter plans requires upgrading to Team at $40/user/month, which adds up for large teams.
Diamond's freemium Hobby tier works for personal repos, but for team use the $20/user/mo Starter is competitive with CodeRabbit ($12/user/mo) and PullRequest ($25/user/mo). The Team tier at $40/user/mo unlocks unlimited AI reviews but may be steep for small startups—consider CodeRabbit for lower-cost unlimited reviews.
In short
Diamond by Graphite — AI code review agent that catches bugs and security issues instantly on GitHub. Best for Engineering teams that ship frequently and want to catch bugs before production, Teams using GitHub who want AI code review without context switching, Dev teams aiming to enforce coding best practices via custom rules. Free to start; paid plans from $20/mo.
What's new in Diamond by Graphite
Checked 15 days agoAcross the latest 2 updates: 2 feature updates.
Introducing Code Tours
Code Tours allows you to review changes across multiple PRs in a unified view, making stacked PR reviews more coherent.
Introducing Cursor Cloud Agents in Graphite
Cursor Cloud Agents are now integrated into Graphite, enabling developers to create, review, and ship code without leaving the PR.
Viability Score
How likely is Diamond by Graphite to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
Last calculated: July 2026
How we score →Key Features
- Instant AI reviews on every PR in seconds
- One-click fix suggestions in GitHub
- Custom rules in plain language with templates (OWASP, Airbnb, a11y, PEP8)
- Noise filters with <5% negative comment rate
- Detects logic bugs, security issues, performance problems, edge cases
- Detects accidentally committed code and documentation issues
- Seamless GitHub integration — no config files needed
- Code Tours for reviewing changes across multiple PRs
- Cursor Cloud Agents integration for in-PR creation and review
- Stack-aware PR insights and automations
- Team insights and analytics dashboard
- Merge queue automation
- Custom automations with triggers
- AI-generated PR titles and descriptions
- Suggested fixes with CI summaries
About Diamond by Graphite
Diamond by Graphite is an AI-powered code review agent that integrates directly with GitHub to deliver instant, high-signal feedback on pull requests. Designed for engineering teams that ship frequently, it analyzes every PR in seconds and surfaces only real problems — maintaining a less than 5% negative comment rate. Key features include one-click fix suggestions, custom rules written in plain language with templates for OWASP, Airbnb style guides, and accessibility, noise filters to reduce false positives, and new Code Tours for reviewing changes across multiple PRs. It also integrates with Cursor Cloud Agents so developers can create, review, and ship code without leaving the PR. Teams like The Browser Company and Braintrust report catching months-old bugs and saving hours of review time. Unlike generic AI tools that flag typos, Diamond focuses on context-aware recommendations, making it a practical choice for fast-moving development teams.
Behind the Verdict
We’d reach for Diamond when our team ships dozens of PRs a week and human review is the bottleneck. The <5% negative comment rate isn't just marketing — it means engineers actually trust the suggestions rather than ignoring them. The custom rules feature is particularly useful: you can enforce your team's style guide or security policies without writing YAML. Code Tours is a welcome addition for teams using stacked PRs, making cross-PR review coherent. Where it bites: the free tier (Hobby) gives only limited AI reviews and chat, so you'll need to pay for serious use. At $20/user/mo for Starter, it's comparable to other AI review tools, but smaller teams may find the cost adds up. Compared to GitHub Copilot Code Review, Diamond feels more focused on catching real bugs rather than style nits. If you're a solo dev on a side project, just use the free tier for occasional checks. But for teams where code quality matters, Diamond is worth the spend.
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Real-world workflow fit
Concrete scenarios for the personas Diamond by Graphite actually fits — and what changes day-one when you adopt it.
Daily code reviews across multiple PRs in a fast-moving team.
Outcome: Diamond catches a logic bug in a PR that would have taken 20 minutes of manual review—detected and fixed in seconds with one click.
Rolling out OWASP-compliant coding practices across the organization.
Outcome: Custom rules based on OWASP templates automatically flag security issues in every PR, reducing human oversight burden.
Managing a multi-PR feature with stacked changes that need coordinated review.
Outcome: Code Tours provides a unified review of all changes across PRs, ensuring dependencies are handled correctly and nothing slips through.
Use Cases
- Automatically catch logic errors and security vulnerabilities before they reach production.
- Enforce team coding standards across every PR with custom rules written in plain English.
- Accelerate code review cycles by accepting AI-suggested fixes with one click.
- Reduce reviewer fatigue by filtering out non-critical comments like naming nits.
- Get contextual AI feedback across stacked PRs, understanding dependencies between changes.
- Review changes across multiple PRs using Code Tours for complex feature rollouts.
Models Under the Hood
as of 2026-07-06
Limitations
- AI review capabilities are limited on Hobby and Starter plans (only limited reviews per month).
- Full unlimited access requires Team plan at $40/user/month.
- The AI may occasionally miss context for very large or complex PRs.
- Custom rules and filters are only available on Team and Enterprise tiers.
as of 2026-06-28
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published Diamond by Graphite tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Hobby
$0/mo
Ideal for
Individual developer or open-source maintainer with personal repos who wants basic AI reviews and CLI stacking.
What this tier adds
Free entry point with limited AI Reviews and limited Graphite Chat; only personal repo support.
Starter
$20/user/mo billed annually
Ideal for
Small team (2-10 developers) shipping production code that needs Slack notifications and team insights but doesn't require unlimited AI reviews.
What this tier adds
Adds all GitHub Org repos, Slack notifications, team insights, suggested fixes + CI summaries; still limited AI Reviews and Chat.
Team
$40/user/mo billed annually
Ideal for
Growing team (10-50 devs) that wants unlimited AI reviews, custom rules, automations, and merge queue to accelerate review cycles.
What this tier adds
Upgrades to unlimited Graphite Chat and AI Reviews, plus AI review customization (automation, filters, rules), automations, and merge queue.
Enterprise
Custom
Ideal for
Large organization (50+ devs) needing SAML/SSO, audit logs, GHES support, custom analytics, and premium SLAs.
What this tier adds
Adds advanced merge queue settings, custom analytics, ACLs, SAML/SSO, audit log (SIEM), GHES support, premium support and SLAs, custom MSA and payments.
Where the pricing makes sense
The company stage and team size where Diamond by Graphite's pricing actually pencils out — and where peers do it cheaper.
Diamond's freemium Hobby tier works for personal repos, but for team use the $20/user/mo Starter is competitive with CodeRabbit ($12/user/mo) and PullRequest ($25/user/mo). The Team tier at $40/user/mo unlocks unlimited AI reviews but may be steep for small startups—consider CodeRabbit for lower-cost unlimited reviews.
Setup time & first value
How long it actually takes to get something useful out of Diamond by Graphite — broken out by persona, not the marketing-page minute.
For a developer: connect GitHub with one click (no config files) and get first AI review within minutes. For a team: admins authorize the GitHub app and set up Slack notifications in under 15 minutes. Full customization (rules, filters) takes about an hour to configure on the Team plan.
Switching to or from Diamond by Graphite
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From CodeRabbit: disable CodeRabbit app, install Diamond via GitHub marketplace, and set up custom rules—Diamond offers similar noise reduction with stronger context awareness.
- →From human-only review: no migration needed—just install Diamond and add AI reviews alongside your existing process.
- ↗To CodeRabbit: uninstall Diamond, install CodeRabbit—both are GitHub apps; you may need to adjust custom rules as they use different syntax.
- ↗To PullRequest: cancel Diamond subscription, onboard PullRequest's human+AI review service—different model (outsourced human reviewers).
Integrations
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