SourceLevel is described as 'reviews your pull requests so you can focus on high-level discussions. It also gathers information on cycle-time, size, and other essential metrics of your team's productivity. Pricing per repository' and is an app in the Development category. There are three alternatives to SourceLevel for Online / Web-based, SaaS and Self-Hosted solutions. The best alternative is Codacy. It's not free, so if you're looking for a free alternative, you could try Code Climate or Code Inspector.
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.