AI Code Review - Free Tool

Overview: Secure Code Review with Top AI

This AI-powered code reviewer was created by the Refact.ai team to automate code reviews and QA tasks. It analyzes code in various programming languages and provides clear instructions for fixing issues and improving code quality.

Use our smart, free tool as a code review template for HTML, Python, Java, C++, Swift, and other programming languages.

How Code Reviewer Works

We made it easy for you to handle your engineering testing tasks by following simple, straightforward steps

Choose review type: please select how you want the code to get checked: by quality, performance, security or through general review with best practices.
Add the code snippet: just share the code for review. You can do that in two ways: either by typing in the textarea or by uploading the file with code.
Choose AI: select from top coding LLMs. There is no registration needed with OpenAI's GPT-4o-mini model.
Get code review: click the red button, and in several seconds our app will define the programming language and provide you with detailed analysis.

Key Features and Advantages

Free, fast, smart, versatile - this is all about our Code Reviewer. Let's take a closer look at the core functionality

Multiple AI support: with our code tester, you can review code using different LLMs. That includes GPT-4o-mini, GPT-4o, and Claude 3.5 Sonnet.
Best code review practices: you can check the code by its quality, stability and performance, security and vulnerabilities.
File support: You can not only copy a piece of code into the application but also upload files. Various formats are supported, including .py, .java, .swift. Max file size is 4.5 MB.
Language auto-recognition: You don't need to select which programming language you provide. Our AI will automatically define the programming language and suggest improvements.
Copying reviews: You can copy the code analysis in one click and paste it to any text editor, repository, or file.

Who May Find This App Helpful

This AI for code review can be useful to anyone who wants to learn programming languages, save time by automating repetitive code check-ups and improve coding skills.

Developers and dev teams can receive quick feedback on written code, allowing them to improve velocity and coding skills over time.
Startups and small businesses often have limited resources, including resources for engineering and testing. Using free AI code review tools may improve the quality and velocity without financial investments.
AI can assist QA engineers and testers in automating certain tasks and ensure that the software meets technical requirements.
Technical university students and anyone learning to code would benefit from the tool that can clarify complex lines, highlight errors and help correct them.

Code Review Example

Below you can find a template showing our AI code testing tool in action:

Code review template for Python

The following code in Python defines a class named StringManipulator that is intended to perform various string manipulation operations.
Let's review it by code quality!


    class StringManipulator:
    
    def reverse_string(self, s):
        return s[::-1]

    def count_vowels(self, s):
        vowels = 'aeiou'
        count = 0
        for char in s:
            if char not in vowels:
                count += 1
        return count

    def to_uppercase(self, s):
        s.upper()

    def main(self):
        test_string = "Hello World"
        reversed_string = self.reverse_string(test_string)
        vowel_count = self.count_vowels(test_string)
        uppercase_string = self.to_uppercase(test_string)

        print("Reversed String:", reversed_string)
        print("Vowel Count:", vowel_count)
        print("Uppercase String:", uppercase_string)

if __name__ == "__main__":
    manipulator = StringManipulator()
    manipulator.main()

Al Model: GPT 4o-mini

As you may see, our tool successfully recognized programming languages, clarified which lines are good, and highlighted all the mistakes with detailed instructions on how to fix them.

FAQ

Frequently asked questions: you ask - we answer.

Is the Code Review tool free to use?

Exactly! By default, with the gpt-4o-mini model, it's absolutely free to use. Moreover, no registration is needed. If you want to try other models or seek advanced help in engineering, please sign up for the Refact.ai Agent

What programming languages does the tool support?

This code reviewer can detect more than 25 of the most popular languages, including HTML, Python, C++, Golang, Java, and more.

Can it explain the code to me?

Sure, detailed reviews made by our tool include explanations of difficult code snippets along with suggestions on how to optimize the code.

What AI does it use?

This tool can use several intelligent large language models to review your code. OpenAI's GPT-4o-mini, the fastest model chosen by default, requires no registration and can be used for free. To use other models, such as Claude 3.5 Sonnet or GPT-4o, you need to sign up (check the full list of supported models).

Which AI is best for coding for free?

That's disputable, to be honest. There are many programming languages and even more various engineering tasks. Different large language models may handle them with varying success rates. To start, we recommend trying the GPT-4o-mini model or even better, try the full version of Refact.ai, where you can test multiple models on one platform and find a model that fits your needs better.

Can I refactor my code using this tool?

While it is capable of refactoring your code, we suggest using another free tool from our directory: the AI-powered Code Generator. Or just sign in to Refact.ai.

Can the tool do AI code review for GitLab?

Yes. GitLab already offers some native review features, such as inline comments or approval workflows. However, you can use our tool for Automated Analysis, line-by-line feedback, and incremental reviews.

Useful links

Refact.ai

Blog: latest news and tips on AI coding and refactoring in Java, Go, Swift, C++, and other languages.
Docs: the manual on using AI for code completion, code refactoring, chat, and more.
AI Agent: let an engineer's "digital twin" handle engineering tasks for you.

About Python

Coursera all online coding courses in one place.
Code Reviews Explained an educational article by Atlassian.