CodeFactor.io is described as 'automatically and continuously tracks code quality with every commit and pull request, helping software developers save time in code reviews and efficiently tackle technical debt' and is an website in the Development category. There are more than 10 alternatives to CodeFactor.io, not only websites but also apps for a variety of platforms, including Windows, Linux, Self-Hosted solutions and SaaS. The best alternative is Codacy. It's not free, so if you're looking for a free alternative, you could try Source-Navigator NG or JSLint. Other great sites and apps similar to CodeFactor.io are Source Insight (Paid), Code Climate (Freemium), JSHint (Free, Open Source) and Landscape (Python) (Free Personal).
Codacy automates code reviews and monitors code quality on every commit and pull request reporting back the impact of every commit or pull request, issues concerning code style, best practices, security, and many others.
Code Climate consolidates the results from a suite of static analysis tools into a single, real-time report, giving your team the information it needs to identify hotspots, evaluate new approaches, and improve code quality.