Semmle is described as 'Code analysis tool, including breakdown of developer contributions, and a clear breakdown of different types of problems with trends over time'. There are four alternatives to Semmle for a variety of platforms, including Online / Web-based, Linux, Mac, Windows and Self-Hosted solutions. The best alternative is SonarQube, which is both free and Open Source. Other great apps like Semmle are Codacy (Freemium), Teamscale (Paid) and CodeSonar (Paid).
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.
Teamscale analyzes the quality of your code. Analyze your code with a variety of static and dynamic analyses to identify specific maintainability constraints and avoid unexpected maintenance costs in the future.
Improve quality, reduce risk, and ship with confidence. GrammaTech's static analysis SAST tool as part of your secure SDLC identifies bugs that can result in system crashes, unexpected behavior, and security breaches.