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AI Code Reviewer

Free to Use

Paste your code and get an instant AI review — issues, quality score, performance tips, and an improved version.

Frequently Asked Questions

Is the AI Code Reviewer free?›
Yes, completely free. No account, no sign-up, and no credit card required. Just paste your code and get an instant review.
Which programming languages does the code reviewer support?›
It supports 15+ languages including JavaScript, TypeScript, Python, Java, C++, Go, Rust, PHP, Ruby, C#, Swift, Kotlin, SQL, Bash, and HTML/CSS.
How does this compare to paid tools like SonarQube or DeepCode?›
SonarQube and DeepCode require setup, CI/CD integration, or paid plans starting at $150+/month. Our tool is free, requires zero configuration, and gives instant feedback — ideal for quick ad-hoc reviews, learning, or freelance projects.
What does the code review actually check?›
The AI identifies bugs and issues by severity, gives a quality score out of 10, flags performance bottlenecks, and returns an improved version of your code — all in one pass.
Is my code stored or shared after I submit it?›
No. Your code is sent to the AI model for processing and is not stored, logged, or used for training. Avoid pasting production secrets or API keys as a general best practice.
Can I use this to review code before a pull request or job interview?›
Absolutely. It is great for cleaning up code before a PR review, preparing for technical interviews, or getting a second opinion on a snippet without waiting for a colleague.

What Is AI Code Reviewer?

An AI code reviewer analyzes your code for bugs, security vulnerabilities, performance issues, code smells, and best practice violations — and suggests specific improvements. Formly's free code reviewer works on any supported language (Python, JavaScript, TypeScript, Java, Go, and more), provides a quality score out of 100, and categorizes findings by severity (critical, warning, suggestion). Think of it as automated pre-commit review before pushing to your repository.

Why Formly's AI Code Reviewer Is the Best Free Option

  • ✓Quality score + categorized issues — see overall code health and prioritized findings.
  • ✓Security-aware — identifies common vulnerabilities: SQL injection, XSS, insecure deserialization.
  • ✓Performance suggestions — spot inefficient algorithms, unnecessary loops, and memory issues.
  • ✓Best practices enforcement — language-specific idioms and standards flagged.
  • ✓Free with no account or API key.

Free Alternative to SonarQube, DeepSource, CodeClimate

→SonarQube: SonarQube requires server setup and enterprise plans for full features. Formly is instant and free.
→DeepSource: DeepSource requires repository connection. Formly lets you paste code snippets directly.
→CodeClimate: CodeClimate charges for private repos. Formly is free for any code snippet.

Who Uses AI Code Reviewer?

Solo developers

Get a second opinion on code quality before shipping features without a formal code review.

Students

Understand quality issues in their code and learn best practices through AI feedback.

Teams doing initial screening

Run quick checks on external submissions or prototype code.

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Looking for a detailed guide? Read our in-depth tutorial on using AI Code Reviewer for professional results.

Read Guide →
Free & unlimited — no account needed. Sign up to save history · Go Pro for advanced features