RunSybil

Based in the US, RunSybil offers an AI-powered offensive security platform that continuously tests applications and infrastructure to uncover vulnerabilities, ensuring robust cybersecurity for critical systems. Based in San Francisco, US, founded in 2023, by its co-founder and CEO Ariel Herbert-Voss and co-founder Vlad Ionescu. RunSybil builds autonomous offensive‑security software that simulates hacker behavior, continuously testing applications and infrastructure to identify exploitable vulnerabilities before real attackers. In January 2026, RunSybil raised USD 30 million in series A funding led by Khosla Ventures, with participation from Section 32, Menlo Ventures, and Conviction.

RunSybil specializes in an AI-powered offensive security platform that offers continuous testing of applications and infrastructure to identify exploitable vulnerabilities. The core product, Sybil, leverages advanced reasoning techniques to emulate the approach of elite human security researchers, allowing it to probe for vulnerabilities across an organization's entire technology stack with each deployment. This platform is designed to serve critical systems that manage customer data, transactions, and access, ensuring enhanced security beyond traditional static scans or periodic penetration tests. RunSybil’s clients include organizations that require ongoing security assessments, such as high-risk application developers and cloud service providers.

The platform is marketed to enterprises across various geographical regions, including North America and Europe, where stringent regulatory requirements for data protection drive demand for comprehensive security solutions. RunSybil's revenue model is centered on a subscription-based service that provides continuous security coverage for its clients. The company engages in direct business-to-business transactions, offering tailored security solutions based on the unique needs of each enterprise client. Clients typically enter into agreements for ongoing access to the Sybil platform, which includes regular updates and assessments that align with their development cycles.

This approach not only enhances security posture but also optimizes operational efficiency, as clients receive timely feedback on vulnerabilities with no delays associated with traditional pentesting timelines. While specific pricing plans are not publicly disclosed, the company’s offerings are structured to provide measurable improvements in security outcomes, thereby justifying the investment made by its clients in proactive security measures. The Company will use the January 2026 funding to advance and scale its artificial intelligence–powered cybersecurity platform that autonomously conducts continuous penetration testing to identify and remediate critical software vulnerabilities.