Best Security Audit Companies in 2024

Discover the best security audit companies from our curated and opinionated list of independent cybersecurity research and penetration testing companies.

Foreword

We have been evaluating security research companies to conduct audits of our source code on GitHub and server infrastructure – and decided to share our findings.

Please note that the companies listed below are not in any particular order, but they have all consistently shown high-quality work during our evaluation period over the past few years.

Cybersecurity Audit and Penetration Testing Companies

Name Website Location Description Publications Our Favorite Publications
Cure53 https://cure53.de/ Berlin, Germany "Fine penetration tests for fine websites" https://cure53.de/#publications Mullvad Servers, Mullvad Apps/API, Mullvad Servers
Radically Open Security https://www.radicallyopensecurity.com/ Amsterdam, The Netherlands "Non-Profit Computer Security Consultancy" https://github.com/radicallyopensecurity/ros-website/tree/main/ros-public-reports F-Droid, Tauri, Mullvad VPN
Assured AB https://www.assured.se/ Gothenburg, Sweden "Experts in technical cybersecurity" https://www.assured.se/publications Mullvad Email Servers, Mullvad API, Mullvad DNS
Trail of Bits https://www.trailofbits.com/ New York, New York, United States "We don't just fix bugs, we fix software." https://github.com/trailofbits/publications Homebrew, Hey, cURL