Hound (houndci.com) is an automated code review tool that comments on style issues in GitHub pull requests, free for public repos.
Hound, found at houndci.com, is an automated code review bot that integrates with GitHub. When a pull request is opened or updated, Hound scans the changed code and leaves inline comments flagging style and quality issues based on configurable linting rules.
The project is maintained by thoughtbot, a software development consultancy whose house style guides form the default rule set. Hound's core code is open source and available on GitHub, while the hosted service at houndci.com is what most teams actually use to connect it to their repositories.
Hound reviews pull requests automatically the moment they are created or updated, posting comments directly in the GitHub PR interface rather than requiring a separate dashboard. Teams can use thoughtbot's default style guides or supply their own configuration per language.
It supports more than a dozen languages and tooling ecosystems, including JavaScript, Ruby, Python, Swift, PHP, Go, Elixir, SCSS/Sass, and Markdown, making it usable across polyglot codebases without needing a separate linting bot per language.
Hound is free to use on public GitHub repositories with no review limit disclosed for that tier. For private repositories, Hound requires a paid subscription based on monthly review volume.
Published plans are Chihuahua at $29/month for up to 50 reviews, Terrier at $49/month for up to 300 reviews, Labrador at $99/month for up to 1,000 reviews, and Husky at $199/month for up to 3,000 reviews.
Yes, Hound is free for public GitHub repositories. Private repositories require a paid plan starting at $29/month.
Hound is maintained by thoughtbot, a software development consultancy, and its style guides form Hound's default rule set.
Hound supports JavaScript, Ruby, Python, Swift, PHP, Go, Elixir, SCSS/Sass, Markdown, and other languages.
Yes, Hound's core codebase is open source and available on GitHub, alongside the hosted service at houndci.com.
Hound automatically scans a pull request when it is created or updated and posts inline comments on style and quality issues.