Free AI Code Review Tools
Which AI pull request reviewers and code quality tools a startup can review its code with for free today, whether the free plan covers private repositories, how many reviews or seats it allows, whether a card is needed and what the first paid plan costs, read from each tool's own page.
Free allowances read on each provider's own pages, all checked on or after . AI code review tools change their free plans often: confirm the terms on the tool's page before you install it on your repositories.
AI code review and code quality tools a startup can use for free today include CodeRabbit (Free reviews forever on public repos), SonarQube Cloud (Free for private projects to 50k LOC), Greptile (50 credits a month, one developer), Qlty (Free: linting and auto-formatting for PRs), and Sourcery (Free forever for public repos). Each of the 13 free offers below links to the tool's page that states it, with its main limit, whether it covers private repositories, whether a card is needed and what the first paid plan costs.
AI code reviewers comment on every pull request: bugs, missed edge cases, security issues and style, before a teammate looks. Static analysis tools add quality and security gates. Many have a free plan, though often only for public or open-source repositories.
The headline rarely tells you how far it goes. A free plan can cover public repositories only, one developer, a monthly credit or token allowance, or start as a short trial. Each tool below shows what is free, its main limit, whether it covers private repositories, whether a card is needed and what the first paid plan costs, quoted from the tool's own page with the date we read it.
Which tools we picked and the order they appear in are our editorial choices; the terms are the tools'. Some of these tools pay us a referral commission when someone signs up through our link: those links are labeled, and they play no part in which tools are listed or where.
AI pull request reviewers with a free plan or trial
Bots that review every pull request, with a free plan, open-source tier or trial.
- 1
CodeRabbit
Public open-source repos that want reviews forever
CodeRabbit's open-source plan gives free reviews forever on public repositories. Essentials, the first paid plan, is $24 per developer a month billed annually.
- Private repos
- No, public repositories only (source: coderabbit.ai)
Start free at CodeRabbitTerms read on coderabbit.ai on CodeRabbit: the free allowance and how to start CodeRabbit Startup Program: what startups get - 2
Greptile
One solo developer who wants a small credit pool
Starter is free for one developer with 50 credits a month. Pro has no seat fees and costs $1 per credit, shared across the organization.
- First paid plan
- Pro: $1 a credit, no seat fees (source: greptile.com)
- 3
Sourcery
Open-source repos on GitHub or GitLab
Sourcery reviews every pull request on public repositories for free, forever. Code review for private repos is on the Pro plan, which costs $12 per developer a month when billed annually.
- Private repos
- No, private repos need Pro (source: sourcery.ai)
- 4
Korbit
Open-source repositories, with a 14-day trial first
Korbit Max is free for all open source repositories. Every plan starts with a 14-day free trial of Korbit Max, and Pro is $12 per user a month billed annually.
- First paid plan
- Pro: $12 a user a month, billed yearly (source: korbit.ai)
- 5
Graphite
Personal projects, stacked PRs, a little AI review
Graphite's Hobby plan is free for personal projects and includes limited AI reviews. Starter is $20 per user a month billed annually.
- 6
Bito
Teams that want to try AI code review for two weeks
Bito's Professional AI code review plan starts with a 14-day free trial, and no credit card is required. After the trial, Professional is $20 to $25 per seat a month.
- What's free
- 14-day free trial, no card (source: bito.ai)
- Payment card
- No credit card required (source: bito.ai)
- First paid plan
- Professional: $20 to $25 a seat a month (source: bito.ai)
- 7
What The Diff
Small repos that want a plain-English PR summary
The Free plan gives 25,000 tokens a month, about 10 pull requests, and no credit card is required. Pro is $19 a month for 200,000 tokens.
- Payment card
- No credit card required (source: whatthediff.ai)
- First paid plan
- Pro: $19 a month, 200,000 tokens (source: whatthediff.ai)
Start free at What The DiffTerms read on whatthediff.ai on What The Diff: the free allowance and how to start
Code quality and static analysis with a free plan
Static analysis, security and quality gates, with a free plan to start.
- 1
SonarQube Cloud
Private projects under 50k lines of code
SonarQube Cloud's free tier covers private projects up to 50k lines of code, with no card and no expiry. Team starts at $34 a month for up to 100k lines.
Start free at SonarSourceTerms read on sonarsource.com on SonarQube Cloud: the free allowance and how to start - 2
Qlty
Teams with many private contributors and linting
Qlty's Free plan is free for unlimited private contributors, with 1,000 analysis minutes a month. Pro is $20 per contributor a month.
- First paid plan
- Pro: $20 a contributor a month (source: qlty.sh)
- 3
Semgrep
Teams of up to 10 contributors scanning for security
Semgrep's Free Edition is no charge for up to 10 contributors and scans up to 10 repositories. Teams starts at $30 per contributor a month.
- Private repos
- Up to 10 private repos (source: semgrep.dev)
- First paid plan
- Teams: from $30 a contributor a month (source: semgrep.dev)
- 4
Snyk
Small teams wanting SCA, SAST and IaC scans
Snyk's Free plan includes SCA, SAST, IaC and container scanning with monthly test caps per product. Team starts at $25 a month.
- First paid plan
- Team: from $25 a month, up to 10 devs (source: snyk.io)
- 5
DeepSource
Open-source maintainers wanting static analysis
DeepSource is free for open-source projects, and always will be, with 1,000 pull request reviews a month. Team is $24 per user a month billed yearly.
Start free at DeepSourceTerms read on deepsource.com on DeepSource: the free allowance and how to start - 6
Codacy
Open-source projects wanting code quality checks
Codacy's open-source projects are free forever. Its free Developer plan is an IDE plugin for individuals, and Team starts at $18 per developer a month billed yearly.
Developer startup programs
Programs from developer tool companies that give startups credits or free months on paid plans.
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Referral links, picked for fit and ordered by fit (70%) and what a signup earns us (30%), at no cost to you. They never change this page's ranking.
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How this comparison is built
The list covers AI code review and code quality tools a founder can use for free today without applying to a program. The order and the "best for" notes are our editorial reading of each tool's terms. Every term comes from the tool's own pricing or help page on the date shown, never from a third-party list; follow each link for the full conditions. A free plan for public repositories only, or a cap on reviews or seats, can matter more than the headline, so the comparison quotes them wherever the tool states them. Some of these tools pay StartupPerks a referral commission, and their links are labeled as referral links; that decides neither whether nor where a tool appears, and no tool pays for a placement on this page.
Read the full methodologyCommon questions
Is there a free AI code review tool for private repos?
Yes, a few. By the terms each tool states, Greptile's Starter plan gives one developer 50 credits a month, Graphite is free for personal projects with limited AI reviews, and What The Diff gives 25,000 tokens a month, while SonarQube Cloud covers private projects up to 50k lines of code and Semgrep up to 10 private repos.
Is CodeRabbit free?
CodeRabbit's reviews are free forever on public repositories. For private repositories, Essentials costs $24 a user a month, billed yearly.
Which AI code review tools are free for open source?
CodeRabbit and Sourcery are free on public repositories, Korbit is free for all open-source repositories, and DeepSource and Codacy are free for open-source projects.
Is SonarQube Cloud free?
SonarQube Cloud is free for private projects up to 50k lines of code. Team starts from $34 a month for up to 100k lines.
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