SonarSource is a company that develops open source software for continuous code quality and security.

Founded by Olivier Gaudin, Freddy Mallet, and Simon Brandhof in 2008, SonarSource is headquartered in Geneva, Switzerland.

[9] SonarSource provides code quality and security products to detect maintainability, reliability and vulnerability issues on 27 programming languages including Python, Java, C#, JavaScript, C/C++, COBOL.

[12] In 2016, the company raised US$45 million of funding from Insight Venture Partners, a US investment firm.

[8][6][7][13] In 2022, SonarSource received with CHF 394.6 million the second largest venture capital financing round of Switzerland of that year.