
Codacy
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Automated style guide enforcement for GitHub pull requests.
Hound automatically reviews GitHub pull requests for style guide violations across 15+ languages, providing instant feedback via status checks and comments, helping teams maintain consistent code quality.

Hound is a Rails‑based service that integrates directly with GitHub to examine pull requests for style guide violations. It targets development teams and open‑source maintainers who want to enforce consistent coding standards without manual review overhead.
Supported languages include Bash, Elixir, Go, HAML, JavaScript, CoffeeScript, TypeScript, Markdown, PHP, Python, Ruby, ERB, Sass/SCSS, and Swift. When a PR contains no issues, Hound reports a successful status, keeping the CI pipeline clean. The service is offered as a hosted solution, and the underlying codebase is available under the MIT license for those who wish to self‑host or contribute.
By delivering inline comments and status checks immediately after a push, Hound reduces back‑and‑forth discussions about formatting, allowing reviewers to focus on functional concerns.
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Enforce Ruby style guidelines
Pull requests with Ruby code receive inline comments for any style violations, ensuring a uniform codebase before merge.
Catch JavaScript formatting errors early
Developers receive status check failures and comments highlighting formatting issues, preventing broken builds caused by lint errors.
Validate Markdown documentation standards
Documentation updates are automatically reviewed for heading hierarchy, line length, and other style rules, keeping project docs clean.
Automate Python code style compliance
Python contributions are scanned for PEP‑8 violations, providing immediate feedback and reducing manual review time.
Hound can review Bash, Elixir, Go, HAML, JavaScript, CoffeeScript, TypeScript, Markdown, PHP, Python, Ruby, ERB, Sass/SCSS, and Swift.
It adds comments to the pull request and updates the GitHub status check, marking the PR as passed when no issues are found.
Hound offers a hosted service; pricing details are available on the website. The codebase itself is open source under the MIT license.
The hosted service uses predefined style guides. Customization would require self‑hosting and modifying the configuration.
Contributions are welcomed via pull requests. See the CONTRIBUTING.md file in the repository for guidelines.
Project at a glance
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