What are some alternatives?
Refactor.io - Share your code instantly for refactoring and code review
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.
CodeFactor.io - Automated Code Review for GitHub & BitBucket
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.
codebeat - Automated code review for Swift
Marketing Optimizer - Optimize conversion rates, increase lead-to-close ratio, and resell leads easily. Includes complete WordPress integration.