Coverity Scan vs Hound: What are the differences?

Developers describe Coverity Scan as "Find and fix defects in your Java, C/C++ or C# open source project for free". Coverity's implementation of static analysis can follow all the possible paths of execution through source code (including interprocedurally) and find defects and vulnerabilities caused by the conjunction of statements that are not errors independent of each other. On the other hand, Hound is detailed as "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.

Coverity Scan and Hound can be primarily classified as "Code Review" tools.

Some of the features offered by Coverity Scan are:

• Test every line of code and potential execution path.
• The root cause of each defect is clearly explained, making it easy to fix bugs
• Integrates with GitHub and Travis CI

On the other hand, Hound provides the following key features:

• Open source
• Free for public repos
• Automated reviews of GitHub pull requests for style guide violations

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.