They contact you to improve your workflow. You can save a lot of time for the first PR (example when you have junior in your team making same mistakes regularly :D )

Codacy had great git and github integration for projects and even user accounts, simple and really easy to use web interface with no clutter and informative. A great amount of programming language supported from PHP to Java. Open-source project friendly with free of charge usage for it and comprehensive amount of code patterns available.

Codacy é fantástico! Eu absolutamente adoro a UI/UX. A grande quantidade de personalizações em torno das regras para revisão de código. Ótimo suporte a linguagens. Adoro as integrações com o GitHub com status. Ainda bastante novo na funcionalidade de revisão de cobertura de testes.