What are some alternatives?
CodeClimate - Code Climate provides automated code review for your apps, letting you fix quality and security issues before they hit production. We check every commit, branch and pull request for changes in quality and potential vulnerabilities.
Refactor.io - Share your code instantly for refactoring and code review
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
Phabricator - Phacility - Phabricator
Stickler CI - Focus on your project, not formatting.
SonarQube - SonarQube is code review and management software. The software is developed by SonarSource, which was founded in 2008 by Freddy Mallet, Simon Brandhof and Olivier Gaudin. Read more about SonarQube.