The AI that reviews your PRs
like a senior maintainer…
but 24/7 and without ego
Save 10+ hours every week on code review. Real security detection, human-quality comments that maintainers actually reply to, Spec Compliance Guard that ensures your code follows the actual project spec (GitHub Spec Kit), weekly OSS Health Score, and auto-changelog. Extremely low noise by design.
Trusted by OSS maintainers of repos with +8k stars
OSS Maintenance without friction
Everything your open-source project needs in a single agent. No YAML, no CI scripts, no endless config.
AI Security Auditor
Detects prompt injection, exposed secrets, AI vulnerabilities, and CVEs in <8 seconds. Automatically blocks merges with critical risk.
Spec Compliance Guard
Automatically verifies each PR against the official project specification (GitHub Spec Kit). Detects drift, generates pending task checklists, and suggests spec.md/plan.md updates. Prevents endless debates and keeps the project vision clear.
Custom Rules
Define your own code, security, and style policies in `.guardian.yaml`. The AI follows them automatically on every review.
Ultra-Human Comments
No more AI slop. Senior dev tone, actionable suggestions, exact line references. Your contributors think it's you.
Low-Noise by Design
Only flags real issues. Zero spam. If there's nothing to report, it stays quiet. 94% less noise than other AI reviewers.
OSS Health Score
Weekly 0-100 score + trends. PR velocity, bug density, dependency freshness. Benchmarked against the top 10% of GitHub. Obsessively actionable.
Auto CHANGELOG
Perfect markdown on every merge. Categorizes features, fixes, breaking changes. Ready for GitHub Releases. Your users notice.
Auto-Fix Suggestions
Doesn't just flag — suggests the exact fix with an applicable diff. Copy-paste or direct commit. Your team learns from every review.
From open PR to safe merge in 3 steps
Connect your repo
Authorize OSS Guardian AI on GitHub. Select which repos to monitor. 2 clicks, 30 seconds.
AI analyzes every PR
When you open a PR, our agent analyzes the diff with advanced AI. Scans for security bugs, anti-patterns, and improvements.
Get reviews + merge safely
Professional comments appear in your PR. Fix what's needed and merge with confidence. CHANGELOG generated automatically.
See it in action — no sign-up needed
Watch how Spec Compliance Guard catches drift in real time. Simulate a full review with security scan, spec compliance check, and actionable suggestions.
See Spec Compliance Guard in action (92% score example) ↑
Why maintainers choose OSS Guardian AI
We're not another generic AI reviewer. We're purpose-built for the real needs of an open-source maintainer.
Low-noise by design
Doesn't spam. If the code is clean, it says so and shuts up. Your devs don't learn to ignore the bot — they learn to trust it. 94% fewer unnecessary comments than other AI reviewers.
The only reviewer that understands your project spec (GitHub Spec Kit)
Doesn't just review code — verifies that the code fulfills the project's actual intent. With integrated Spec Compliance Guard, every PR is validated against your spec.md and plan.md automatically. Nobody else does this.
Built for OSS, not enterprise
CodeRabbit and Greptile are built for enterprise teams with heavy processes. OSS Guardian AI is lightweight, fast, and understands the GitHub Issues + PRs + Releases flow like another maintainer.
A price a maintainer can afford
$19/month for 3 repos. Less than a pizza delivery. CodeRabbit charges $12/seat and Greptile starts at $100/month. We believe OSS deserves accessible tools.
Integrates without changing your workflow
Install the GitHub App in 2 clicks. Zero YAML, zero CI scripts, zero manual webhooks. Open a PR and get your review in <3 minutes. Like having a senior dev on your team without hiring one.
What maintainers
“Finally a reviewer that actually checks my spec. Game changer.”
Maintainer · 12k ⭐ repo
OSS Maintainer
“Low noise + Spec Compliance = I can finally trust AI reviews. My team actually reads the comments now.”
Core Maintainer · 5.4k ⭐ repo
Core Contributor
“Saved me from merging a broken spec change. That alone paid for the entire year. The Health Score is addictive.”
Engineering Lead · Fintech
OSS Maintainer
“The only AI reviewer my team doesn't ignore. They actually read the comments and fix the issues. 94% less noise is real.”
Lead Developer · B2B SaaS
Core Contributor
“I use it across 3 projects with 500+ PRs per month. The security scanner saved me from publishing an API key in a public commit. Worth every cent.”
Engineering Lead · Fintech
Go + Rust microservices
“Migrated from CodeRabbit to OSS Guardian AI because the reviews are much deeper and codebase-specific. Plus the Health Score dashboard helps me prioritize which issues to tackle.”
OSS Maintainer · 12k ⭐ repo
React ecosystem
Simple, transparent
Free for repos with <50 stars (limited reviews)
Starter
Perfect for individual maintainers.
- Up to 3 repositories
- AI PR review (100 PRs/month)
- Basic security scanner
- CHANGELOG generator
- Community support
Pro
Teams and large repos.
- Unlimited repositories
- Unlimited AI PR review
- Advanced security scanner
- OSS Health Score dashboard
- Auto-fix suggestions + One-Click Apply Fix
- Custom review rules
- Priority processing + Advanced Auto-Fix
- Spec Compliance Guard
- Priority support
Refer a friend → both get 1 month free
First month 100% free if you don't save at least 5 hours of code review time. No questions asked.
Frequently asked questions
How does OSS Guardian AI work?
What languages are supported?
Is my data secure?
Is there a free tier?
Can I cancel anytime?
How does it integrate with my workflow?
How is it different from Copilot or CodeRabbit?
What's the response SLA?
Ready to have a senior dev reviewing every PR?
Connect your repo in 30 seconds. 7 days free. No credit card. If you don't save 5+ hours in your first week, we'll refund your month.
Free for projects with <50 stars. No fine print.