Best Free AI Code Review Tools of 2025

Cody is an advanced AI coding assistant developed by Sourcegraph to enhance the efficiency and quality of software development. It integrates seamlessly with popular Integrated Development Environments (IDEs) such as VS Code, Visual Studio, Eclipse, and various JetBrains IDEs, providing features like AI-driven chat, code autocompletion, and inline editing without altering existing workflows. Designed to support both individual developers and teams, Cody emphasizes consistency and quality across entire codebases by utilizing comprehensive context and shared prompts. It also extends its contextual understanding beyond code by integrating with tools like Notion, Linear, and Prometheus, thereby gathering a holistic view of the development environment. By leveraging the latest Large Language Models (LLMs), including Claude 3.5 Sonnet and GPT-4o, Cody offers tailored assistance that can be optimized for specific use cases, balancing speed and performance. Developers have reported significant productivity gains, with some noting time savings of approximately 5-6 hours per week and a doubling of coding speed when using Cody.

Codeium is the modern code superpower. It's a free AI-powered code acceleration toolkit. Codeium currently provides AI-generated autocomplete in more than 20 programming languages (including Python and JS, Java, TS, Java and Go) and integrates directly to the developer's IDE (VSCode, JetBrains or Jupyter notebooks. Colab, Vim / Neoovim, etc. Codeium generates multiline code suggestions in a matter of seconds. This will eliminate the need to search for APIs and documentation, write boilerplate and unit test scripts, and many other tedious or frustrating tasks. Codeium is a training platform that allows you to quickly develop on billions of lines. It also helps you stay in the flow and lets you become the best coder you can be.

Qodo, formerly Codium, analyzes your code to find bugs before you release. Qodo maps the behaviors of your code, identifies edge cases and tags anything suspicious. It then generates meaningful and clear unit tests that match the behavior of your code. You can see how your code behaves and how changes to your code affect the rest of the code. Code coverage is broken. Meaningful tests check functionality and give you the confidence to commit. Spend less time writing questionable tests and more time developing features that are useful to your users. Qodo analyzes your code, docstring and comments to suggest tests as you type. You only need to add them to your suite. Qodo focuses on code integrity. It generates tests that help you understand your code, find edge cases and suspicious behavior; and make your code more robust.

Introducing your AI coding companion: GitHub Copilot, which provides whole line or entire function suggestions directly within your coding environment. Drawing from billions of lines of publicly available code, GitHub Copilot ensures that essential knowledge is always at your disposal, allowing you to save valuable time and maintain your concentration. Currently accessible as an extension for Visual Studio Code, it operates seamlessly both on your local machine and in the cloud via GitHub Codespaces. Its responsiveness allows you to receive suggestions in real-time as you type. Supporting a wide array of frameworks and programming languages, the technical preview excels particularly in Python, JavaScript, TypeScript, Ruby, and Go, while also having the capability to assist with numerous other languages. With GitHub Copilot, you maintain complete control over the coding process, as you can sift through various suggestions, decide which ones to implement or dismiss, and make manual adjustments to the proposed code. Additionally, GitHub Copilot fine-tunes its recommendations based on your coding style, ensuring a more personalized programming experience. This innovative tool truly empowers developers by enhancing productivity and creativity in their coding endeavors.

Enhance the speed and efficiency of software development and delivery by leveraging generative AI support, all while ensuring robust enterprise security and privacy safeguards. Gemini Code Assist streamlines your coding process by completing your code as you type and can generate entire code blocks or functions upon request. This powerful code assistance tool is compatible with a variety of popular integrated development environments (IDEs) like Visual Studio Code and JetBrains IDEs (including IntelliJ, PyCharm, GoLand, and WebStorm), as well as Cloud Workstations and Cloud Shell Editor, supporting over 20 programming languages such as Java, JavaScript, Python, C, C++, Go, PHP, and SQL. Utilizing a natural language chat interface, you can easily interact with Gemini Code Assist to obtain solutions to your coding queries or gain insights into coding best practices, with chat functionality accessible across all supported IDEs. Organizations have the flexibility to tailor Gemini Code Assist by integrating their private codebases and knowledge repositories, enabling the tool to provide more personalized assistance that aligns with specific enterprise needs. Furthermore, Gemini Code Assist has the capability to facilitate extensive modifications across entire codebases, thereby optimizing the development workflow significantly. This adaptability not only boosts productivity but also empowers teams to innovate more rapidly in a secure environment.

GoCodeo is a comprehensive AI platform for developers that accelerates coding, testing, and debugging processes. The platform integrates with VS Code to offer real-time assistance, from generating code snippets to automatically creating unit tests. GoCodeo’s AI-driven tools also provide debugging insights, enabling developers to identify and fix issues faster. With support for multiple programming languages and frameworks, GoCodeo empowers developers to write high-quality, production-ready code with less effort, streamlining development cycles and enhancing efficiency across projects.

Bito's AI assists developers to dramatically increase their impact. It's a Swiss Army Knife of capabilities that can increase your developer productivity by 10x and save you up to an hour per day. The same models are used in ChatGPT. Bito AI allows you to easily write code, understand syntax and write test cases. It also allows you to explain code, comment code, check security, or explain high-level concepts. It's amazing what we can do for you without you having to search the internet or waste your time on tedious tasks. Talented dev teams are the key to innovation. They bring ideas and concepts to life. Dev teams will be the master masons behind intelligent, scalable software that powers some of humanity's most amazing inventions.

CodeSandbox aims to make it easier for you to express your ideas with code, and to validate them. It also removes the hassles of setting up development tooling and sharing your project. Join us to help build the future of web coding. Over 4M developers use the platform each month. This includes organizations like Shopify and Atlassian. Since its launch, creators have created over 35M apps. It's used in thousands of open-source projects like React, Vue and Babel. You can invite your friends, colleagues, or team to join you or simply view your creation by using a URL. Use any of 1M+ packages for building real, powerful applications quickly and efficiently. Import and run repos directly from GitHub or choose from hundreds of templates to start in seconds. Boxy, CodeSandbox's AI-powered coding assistant, is now available to all Pro subscriptions.

Avoid being hampered by onboarding challenges, knowledge silos, or context switching by utilizing Swimm to create and modify documents that are seamlessly integrated with your code, automatically updated, and embedded in your workflow. With a language-agnostic editor and features like Smart Tokens and Snippet Studio, Swimm provides a robust foundation for contemporary documentation practices. Craft engaging, media-rich documents that are closely tied to your codebase with ease. The Auto-sync algorithm ensures your documentation remains aligned with any refactoring or structural changes, sparing you from the hassle of updating file names, function names, or implementations. Swimm actively monitors your documentation as your code changes, alerting you to any discrepancies that arise. You can conveniently access documents alongside the relevant code, maintaining your focus within your IDE. When you click a link, a new tab opens with the documentation rendered flawlessly from Markdown, ensuring a smooth and uninterrupted workflow. This streamlined approach not only enhances collaboration but also maximizes productivity, allowing teams to work more efficiently together.

Work seamlessly with colleagues and AI without having to abandon your preferred tools, thereby reducing interruptions and the need to switch contexts. Pullflow connects user identities and code-review processes across GitHub, Slack, and VS Code, allowing for fluid conversations across different platforms. You can initiate actions from any location and effortlessly return to your workflow. With integrations into GitHub Actions, external CI/CD systems, GitHub apps, and additional services, Pullflow provides a comprehensive overview of your pull requests, spanning from drafts and reviews to testing and deployment. Let Pullflow handle swift actions for you with a simple chat mention or a keyboard shortcut in your IDE, enabling you to request reviews, manage labels, provide feedback, approve, and perform other tasks without needing to navigate to GitHub. This streamlined approach enhances productivity and keeps your focus intact, making collaboration more effective and enjoyable.

Experience a privacy-centric approach to pull request evaluations that offers detailed code recommendations on each line and an evolving interactive chat feature. The changes within the pull request are summarized effectively, making it easier to grasp the purpose behind the modifications. Automated release notes are generated, ensuring they can be seamlessly integrated into your release documentation. Each code alteration is scrutinized with a thorough analysis, providing clear and actionable feedback that's ready for implementation. You can engage with the bot by asking questions directly within your code and supplying additional context for it to generate code snippets. As your conversations with the bot increase, its intelligence grows, leading to quicker review cycles and high-caliber suggestions for code changes. Your information remains private, allowing it to tailor the review process to your needs. This system continually adapts based on your interactions, enhancing the relevance of its recommendations to match your coding style and preferences over time.

Access immediate code evaluations from qualified engineers, augmented by AI technology. Each time you initiate a pull request, you can seamlessly integrate senior engineers into your workflow. Accelerate the delivery of superior, secure code with the support of AI-driven code assessments. Whether your development team comprises 5 or 5,000 members, PullRequest will elevate your code review system and tailor it to suit your requirements. Our expert reviewers assist in identifying security threats, uncovering concealed bugs, and addressing performance challenges prior to deployment. This entire process is integrated into your current tools for maximum efficiency. Our seasoned reviewers, bolstered by AI analysis, can target critical security vulnerabilities effectively. We employ advanced static analysis that incorporates both open-source resources and proprietary AI, providing reviewers with enhanced insights. Allow your senior personnel to focus on strategic initiatives while making substantial strides in resolving issues and refining code, even as other team members continue to develop. With this innovative approach, your team can maintain productivity while ensuring code quality.

Streamline your workflow by delegating smaller tickets to an AI assistant. Tusk empowers software engineers to tackle chore tickets with remarkable efficiency, allowing them to work at the speed of thought. It automatically refines its code modifications to manage any feedback from code reviews attached to the pull request. A competent engineer understands the importance of testing before code deployment. Tusk conducts your automated tests and checks to ensure that the pull request is functional. Even if a pull request is not feasible, we still save you time by offering code context that you can use as a foundation for your work. With Tusk, you can remain undistracted by project managers concerning chore tickets and concentrate on meaningful tasks while elevating your product's quality. Investigating and resolving customer-reported bugs can take considerable time and effort. Allow Tusk to conduct the initial assessment for fixing these issues. We recognize that your time is better spent than simply adjusting a word in a header or searching and replacing terms throughout numerous files. Let Tusk manage your product quality backlog and handle the UI/UX updates that you may have been postponing for far too long. In doing so, you can reclaim your time and focus on more significant aspects of your projects.

DeepCode AI serves as the foundation of Snyk code, making it the quickest and most precise Static Application Security Testing (SAST) solution available. By harnessing DeepCode AI within the Snyk platform, which leverages various AI models and is honed using data focused on security, Snyk provides users with the advantages of artificial intelligence while mitigating potential downsides. Supporting 11 programming languages, DeepCode AI is crafted to identify and remediate vulnerabilities, as well as address technical debt effectively. This innovative AI also facilitates Snyk's one-click security solutions and extensive application coverage, empowering developers to build swiftly while maintaining robust security measures. Developed and continuously improved by expert researchers, DeepCode AI relies on millions of open-source projects for its training, ensuring no customer data is utilized. Ultimately, DeepCode AI employs a hybrid strategy with multiple models and specialized training sets, all aimed at enhancing application security. This commitment to innovation ensures that developers can confidently deploy applications without compromising safety.

Metabob identifies, interprets, and resolves coding issues arising from both human and AI sources. By leveraging advanced graph neural networks for detection and large language models for explanation and resolution, Metabob merges the strengths of both technologies. The graph neural networks analyze and categorize problematic code while maintaining contextual awareness. This problematic code, enriched with relevant context, is then stored in Metabob's backend system. The information retained in the backend is subsequently utilized by an integrated large language model. This model produces tailored explanations and solutions based on the context provided. Metabob's AI has been trained on an extensive dataset of millions of bug fixes executed by skilled developers. With a deep understanding of code logic and context, Metabob is capable of identifying intricate issues that span multiple codebases, automatically creating suitable fixes. The AI code review feature of Metabob can uncover hundreds of logical issues, including race conditions and unhandled edge cases, which often go unnoticed by conventional static analysis tools. This innovative approach not only enhances debugging efficiency but also elevates the overall quality of the codebase.

Elevate your coding efficiency and identify bugs more swiftly through AI-generated summaries and real-time communication tools. Instantly gain context on each pull request with AI summaries, allowing your team to expedite the code review process. By incorporating immediate, actionable insights on every submission, you can enhance code quality and accelerate product delivery. Engage in conversations with AI via GitHub Pull Request Comments to identify potential issues and receive prompt feedback on your code. Tailor your code review assistant by establishing specific rules and filters that align with your team's requirements for optimal performance. With GitChat, you can revolutionize your code reviews, leading to improved code quality and faster product launches. Streamlining your development process has never been easier.

Optimize your Git commands and effortlessly manage stacked pull requests directly from your terminal. You can visually create and modify stacked PRs without leaving your integrated development environment, ensuring a seamless workflow. Keep all of your PRs and review requests organized in a single inbox for easy tracking. Receive immediate, actionable insights on each pull request thanks to Graphite's AI, which is aware of the codebase context. Prevent merge conflicts and maintain a clean main branch, regardless of whether your team consists of 10 or 10,000 members. Boost your team's productivity with robust, real-time metrics for developers. Experience a faster, more intuitive Git interface that simplifies the stacking process. Use the command 'gt create' again to add another branch atop your existing changes, eliminating the need to wait for merges into the main branch. Your local stack will automatically sync with remote updates, and you can easily tidy up outdated branches using 'gt sync'. Modify changes across your entire stack with the 'gt modify' command, while Graphite takes care of all the recursive rebasing tasks for you. With 'gt submit', you can create or update PRs for each branch within your stack, ensuring a streamlined and efficient development process. This innovative approach to Git management empowers developers to focus more on coding rather than on handling complex version control issues.

A specialized framework designed to tackle the complexities of autonomous intelligence is now available. You can keep developing software using your established language practices, libraries, APIs, data, and models. Your unique autonomous product is engineered to adapt and expand in alignment with your development needs. Autonomous AI has the capability to streamline video production by generating, editing, and enhancing content, which dramatically lessens the manual workload involved. By incorporating AI technologies such as Luma AI or OpenAI for video creation, along with leveraging Azure for scalable text-to-speech solutions, your autonomous system is positioned to deliver top-notch video content. Furthermore, by connecting with platforms like YouTube, your autonomous AI can perpetually refine its capabilities based on user feedback and engagement metrics. We are convinced that the pathway to Artificial General Intelligence (AGI) lies in the collaboration of countless autonomous systems. Our dedicated team consists of enthusiastic engineers and researchers committed to advancing autonomous artificial intelligence. If this concept resonates with you, we would be eager to connect and explore possibilities together.

Pythagora is an innovative platform powered by artificial intelligence that assists developers in creating comprehensive web applications while significantly reducing the amount of coding required. It features an array of AI agents that work together to generate code, conduct reviews, create tests, troubleshoot issues, and deploy applications seamlessly. By automating numerous steps in the software development lifecycle, Pythagora enhances developer productivity and speeds up the overall development timeline. The platform facilitates frontend development using React and backend processes with Node.js, with plans to introduce Python support shortly. With its capability to manage various facets of the development process, Pythagora is particularly well-suited for swiftly producing both minimum viable products and applications ready for production. Furthermore, it streamlines the development of scalable and maintainable solutions, catering to the needs of both emerging startups and established corporations alike. Overall, Pythagora aims to revolutionize the way developers approach application development by making it more accessible and efficient.

Forge is an innovative AI-powered code review tool aimed at significantly cutting down the time developers spend on code evaluations, all while promoting high standards of code quality and maintainability. At present, Forge is in its beta stage and is exclusively offered to Teams users across GitHub Free, GitHub Pro, GitHub Team, and GitHub Enterprise Cloud. By leveraging AI technology, users can gain a clearer understanding of the code changes they are assessing, along with instant suggestions that streamline the review process and align the author with the reviewer. To make the review process more engaging, users can incorporate GIFs and AI-generated ASCII art into their feedback. Moreover, the AI capability allows for a thorough examination of the code, ensuring that it adheres to organization-specific or team-specific coding standards. Functionally, Forge operates as a Chrome extension that transforms the traditional Code Review process into a more dynamic and AI-enhanced experience. With an array of AI features integrated throughout, Forge not only enriches the review workflow but also retains the essential actions that developers typically perform during code assessments. This seamless blend of innovation and familiarity equips developers with the tools they need to enhance their coding practices effectively.

Patched is a managed service that utilizes the open-source Patchwork framework to streamline various development tasks, including code reviews, bug fixes, security updates, and documentation efforts. By harnessing the capabilities of large language models, Patched empowers developers to create and implement AI-driven workflows, known as "patch flows," which automatically manage activities following code completion, ultimately improving code quality and speeding up development timelines. The platform features an intuitive graphical interface along with a visual workflow builder, which facilitates the personalization of patch flows without the burden of overseeing infrastructure or LLM endpoints. For users interested in self-hosting options, Patchwork offers a command-line interface agent that integrates effortlessly into existing development workflows. Furthermore, Patched prioritizes privacy and control, allowing organizations to deploy the service within their own infrastructure while using their specific LLM API keys. This combination of features ensures that developers can optimize their processes while maintaining a high level of security and customization.

Fynix serves as an AI-driven platform aimed at enhancing software development efficiency by providing smart coding assistance and agent-based code reviews. This tool seamlessly integrates with widely used IDEs such as VS Code, offering features like context-aware autocomplete, natural language inputs for code corrections and translations, along with automatic visualizations of code flow. The Code Assistant feature of Fynix enables developers to produce cleaner and more efficient code at an accelerated pace, and the forthcoming Code Quality Agent promises to streamline bug detection while upholding coding standards. Supporting a variety of programming languages and frameworks, and compatible with tools like Jira, Fynix proves to be a flexible solution for fostering improved coding practices and team collaboration. As developers strive for excellence in their coding endeavors, Fynix stands out as an essential ally in the software development landscape.

Diamond is a sophisticated AI tool designed for code review that delivers prompt, actionable insights on each pull request, thereby improving code quality and speeding up development timelines. It automatically detects various potential problems, including logical errors, security flaws, performance issues, and inconsistencies in documentation, which enables teams to concentrate on development rather than manual code checks. Eliminating the need for complex setups, Diamond integrates effortlessly with your repository, providing valuable, context-aware suggestions without the clutter often found in other AI solutions. Users have the flexibility to tailor review criteria by uploading their preferred style guides and filtering out irrelevant comments, ensuring a streamlined and effective review process. Additionally, Diamond offers analytical insights on review metrics, categorizing issues and proposing fixes that can be implemented with a single click, making the entire review experience more efficient. By utilizing Diamond, teams can enhance their collaborative efforts and maintain a high standard of code integrity throughout their projects.

Codacy is an automated code review tool. It helps identify problems through static code analysis. This allows engineering teams to save time and tackle technical debt. Codacy seamlessly integrates with your existing workflows on Git provider as well as with Slack and JIRA or using Webhooks. Each commit and pull-request includes notifications about security issues, code coverage, duplicate code, and code complexity. Advanced code metrics provide insight into the health of a project as well as team performance and other metrics. The Codacy CLI allows you to run Codacy code analysis locally. This allows teams to see Codacy results without needing to check their Git provider, or the Codacy app. Codacy supports more than 30 programming languages and is available in free open source and enterprise versions (cloud or self-hosted). For more see https://www.codacy.com/

Streamline your development process by automating the generation of pull request summaries. When you open a pull request, you'll receive a concise overview of the changes in mere seconds. This feature allows for quick comprehension of the impact of minor pull requests while also providing a significant advantage when dealing with larger ones. The process of code review often consumes a lot of time due to the necessary dialogue between the reviewer and the author, frequently over trivial changes that could be automated instead. By commenting on specific lines of code with the command /wtd and outlining your desired modifications, What The Diff will propose those adjustments directly within the pull request, enabling you to accept them effortlessly with a single click. Additionally, What The Diff evaluates the modifications in your pull requests and presents a summary in straightforward language, eliminating the need for manual summaries. With extensive training on a vast array of code data, it supports nearly all programming languages. You can easily install the GitHub app for free and test it out on any of your repositories, making it a valuable tool for enhancing team collaboration. Embrace this technology to significantly reduce the workload associated with code reviews.