10 Best Code Review Tools in 2026

Prettier formats code automatically, removing debates about style. It makes decisions about formatting—line length, quotes, semicolons, indentation—so you don't have to. The opinions are opinionated, but consistency is the point. The key insight is that formatting should be automated, not discussed. Prettier makes choices, and teams accept them. Energy goes to the code, not the style guide. Multi-language support covers JavaScript, TypeScript, CSS, HTML, JSON, YAML, and more. One tool handles formatting across your project. Editor integration formats on save. Write code however you want; Prettier fixes it when you save. The workflow eliminates thinking about formatting entirely. CI integration catches unformatted code. Fail builds that haven't been formatted, ensuring consistency in the repository. The configuration is intentionally limited. You can adjust a few options, but Prettier doesn't offer fine-grained control. This limitation is a feature—it prevents style debates. For teams adopting Prettier, the transition period involves adjusting to its choices. After that, formatting simply isn't a concern anymore.

When it comes to automating code review in modern development workflows, CodeRabbit stands out as a leading solution that integrates seamlessly with GitHub and GitLab. The platform acts as an always-available AI reviewer that catches bugs, security vulnerabilities, performance issues, and style violations before they make it into production. Developers can interact with CodeRabbit directly through PR comments, asking questions about suggested changes, requesting clarifications, or getting help implementing fixes. The AI understands the full context of your codebase and provides explanations alongside its suggestions, helping teams learn and improve their coding practices over time. Beyond simple linting, CodeRabbit performs deep analysis of code changes including logic errors, edge cases, and potential runtime issues. It adapts to your team coding standards and can be customized to focus on the types of issues most relevant to your projects. The tool has earned its reputation as the most-installed AI app on GitHub by consistently delivering actionable, high-quality feedback that saves development teams significant time in the review process.

ESLint catches problems in JavaScript and TypeScript code before they cause issues. It's the standard linter for the JavaScript ecosystem, running in editors and CI pipelines to maintain code quality. The rules are configurable. Enable, disable, or configure individual rules to match your team's preferences. Start with a preset like Airbnb or Standard, then adjust from there. Plugins extend ESLint to frameworks and tools. React, Vue, TypeScript, imports, accessibility—plugins add rules specific to your stack. The ecosystem covers most needs. Auto-fixing handles many issues automatically. Run ESLint with the fix flag, and it corrects what it can. Simple issues like formatting, import order, and unused variables clean up without manual editing. Editor integration provides immediate feedback. See problems as you type, with suggestions for fixes. The feedback loop is tight enough that issues get caught early. Integration with Prettier separates concerns. ESLint handles logic and quality; Prettier handles formatting. Together, they cover code style comprehensively. The configuration can be complex for new projects. But once set up, ESLint runs invisibly, catching mistakes before they reach review or production.

Delta is a command-line tool designed to enhance the readability and user experience of `git`, `diff`, and `grep` output. It acts as a pager, similar to `less`, but with advanced syntax highlighting and layout customization capabilities. This allows developers to more efficiently study code changes and search results. The tool is ideal for developers, engineers, and anyone who regularly works with version control systems and command-line tools. It aims to make the process of reviewing code differences and `grep` output more enjoyable and efficient by providing extensive control over styling, including line numbers and side-by-side views, while also allowing users to maintain a look close to the default output if preferred.

Swimm is an Application Understanding Platform that leverages AI-powered static analysis to reverse engineer legacy code, particularly mainframe applications. It builds a knowledge base from the code, revealing architecture, patterns, and hidden logic, and creates a living inventory of programs, modules, and dependencies with explanatory names. This allows organizations to inventory, assess, and understand their systems, uncover buried business logic, and identify areas for change. The platform helps teams plan migrations, write specifications, and align around modern architecture. It provides a complete overview of a codebase's architecture, documents business logic, and automatically generates diagrams with explanations of dependencies, user screens, variables, and job flows. Swimm is designed for CIOs to accelerate timelines and de-risk initiatives, for product and analysts to create specs without relying on mainframe experts, and for developers to understand code connections. It emphasizes accurate, hallucination-free explanations through a combination of deterministic code analysis and AI, and is enterprise-grade, secure (SOC2, ISO 27001), scalable, and customizable, supporting various deployment models including on-premise and cloud.

pre-commit is a tool designed to manage and run Git hook scripts automatically before every commit. It helps developers identify and fix simple issues like missing semicolons, trailing whitespace, and debug statements, allowing code reviewers to focus on architectural changes rather than trivial style nitpicks. It addresses the pain points of sharing and managing pre-commit hooks across multiple projects, eliminating the need to copy and paste bash scripts or manually adapt them. This tool acts as a multi-language package manager for hooks, enabling users to specify desired hooks, and pre-commit handles their installation and execution regardless of the hook's language or whether the developer has that language installed. It's built to operate without requiring root access, automatically downloading and building necessary language environments (e.g., Node.js for ESLint) if they are not present on the developer's machine. This makes it an invaluable tool for development teams looking to enforce consistent code quality and style standards across diverse projects and developer environments.

CodeSandbox is an instant development environment for web projects. Start coding in seconds without local setup. Collaborate in real-time like Google Docs for code. Branches for every pull request and issue. Native VS Code support with live collaboration. Development environments that spin up faster than you can type.

Sourcegraph is a code intelligence platform for searching and understanding code across repositories. Features code search, navigation, insights, and batch changes.

SonarQube is a code quality and security analysis platform. Automatic code review detects bugs, vulnerabilities, and code smells. Supports 30+ programming languages. Quality Gates enforce standards in CI/CD. Security hotspots highlight potential vulnerabilities. The code quality tool that catches issues before they become problems.

Windsurf is an AI-powered code editor and assistant. Features intelligent completions, chat, code reviews, and access to premium AI models including SWE-1.5.