Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
Refactor.io - Share your code instantly for refactoring and code review
codebeat - Automated code review for Swift
CodeStream - CodeStream helps development teams resolve issues faster, and improve code quality by streamlining code reviews inside your IDE
Stickler CI - Focus on your project, not formatting.
Codebeat for iOS - Automated code review for iOS