Hound vs Refactor.io: What are the differences?
Hound: A hosted service that comments on Ruby style guide violations in your GitHub pull requests. Take care of pesky code reviews with a trusty Hound. Hound reviews GitHub pull requests for style guide violations; Refactor.io: Share your code instantly for refactoring and code review. Online code refactoring tool. Paste your code and have it shared instantly for review.
Hound and Refactor.io can be primarily classified as "Code Review" tools.
Hound is an open source tool with 1.72K GitHub stars and 393 GitHub forks. Here's a link to Hound's open source repository on GitHub.