SensioLabs Insight is described as 'SensioLabsInsight is a quality assurance tool that analyzes your source code to find problems that degrade the overall quality of your projects'. There are more than 10 alternatives to SensioLabs Insight, not only websites but also apps for a variety of platforms, including Windows, Linux, Self-Hosted solutions and SaaS. The best alternative is SonarQube, which is both free and Open Source. Other great sites and apps similar to SensioLabs Insight are Codacy (Free Personal), Source Insight (Paid), Blink grep (Free, Open Source) and Source-Navigator NG (Free, Open Source).
SonarQube is an open source quality management platform, dedicated to continuously analyze and measure source code quality, from the portfolio to the method. Static code analysis is available in the "Community Edition" (free / open source) for:
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.