RunSybil
Revolutionize cybersecurity: AI-driven, rapid, accurate pentesting tool.. [Contact for Pricing]
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What is RunSybil?
RunSybil is an AI-powered offensive security platform that continuously tests applications and infrastructure for exploitable vulnerabilities by reasoning about systems the way an elite human researcher would, but across the entire stack on every deployment. The platform automates hacker intuition to discover, test, and remediate vulnerabilities across the application attack surface without requiring access to source code.
Key features include continuous attack surface monitoring that maps the entire stack covering code, APIs, cloud, and infrastructure; AI-driven pentesting that chains vulnerabilities to surface real exploitable paths; attack replay functionality to instantly re-test fixes; security feedback on every pull request; and validation of fixes through unlimited retests. The platform operates across four core phases: Map (automatically discovers hidden endpoints and forgotten assets), Attack (conducts automated offensive testing with context-aware analysis), Fix (supports remediation workflows with prioritization and guidance), and Test (validates fixes are effective).
RunSybil is designed for security teams and organizations seeking to enhance their security posture through automated, AI-driven penetration testing. It targets enterprises, mid-market, and SMB organizations handling AI pentesting, attack paths, continuous testing, and vulnerability prioritization. The platform is particularly suitable for high-risk application security testing, multi-tenant and business logic testing, bug bounty replacement, and cloud infrastructure security validation. It enables CTEM programs by owning the Validation phase.
RunSybil pricing
Pricing model: Freemium
RunSybil offers a Free Tier with limited access at no cost, and a Pro Tier starting at $99 per month. The platform is positioned as a commercial offering for production security operations with vendor support and SLAs. Pricing may change, so checking the official website for the latest details is recommended. The company raised $40M in funding led by Khosla Ventures to build their AI-native offensive security platform.
RunSybil pros
- AI-powered reasoning like an elite human security researcher
- Continuous testing on every deployment, not periodic pentests
- No source code access required - black-box testing approach
- Chains vulnerabilities across stack to find real exploitable paths
- 90% reduction in false positives compared to standard scanners
- Attack replay feature to instantly re-test fixes
- Security feedback on every pull request
- Discovers hidden endpoints and forgotten assets automatically
- Validates whether vulnerabilities are actually exploitable
- Unlimited retests to verify remediation effectiveness
- Reduces time and cost vs traditional penetration testing
- Real-time visibility into identified vulnerabilities
- Integrations with popular security tools
- Predictable cost vs unpredictable bug bounties
- Zero triage burden with pre-validated findings
- Coverage gets smarter with every sprint
- Founders from OpenAI, Meta, Mandiant, Trail of Bits
RunSybil cons
- Relatively new startup founded in 2023 with limited track record
- $99/month Pro tier may be expensive for small teams
- Primarily black-box testing may miss some code-level issues
- Limited public documentation compared to established tools
- Cloud-only deployment may not suit all enterprise requirements
- AI reasoning may still miss novel attack vectors humans find
- Requires external access to test systems (not internal scanning)
- New platform may have undiscovered bugs or limitations
Frequently asked questions about RunSybil
What is RunSybil and how does it work?
RunSybil is an AI-powered offensive security platform that continuously tests applications and infrastructure for exploitable vulnerabilities. It uses autonomous AI agents that reason about systems the way an elite human researcher would, chaining vulnerabilities across your stack to find real attack paths. Unlike traditional scanners that look for signatures, Sybil uses adversarial reasoning to probe logic, validate exploitability, and discover vulnerabilities that only exist where components connect.
How is RunSybil different from traditional penetration testing?
Traditional pentests are point-in-time engagements where you wait 30+ days for a report, and findings go stale immediately after you ship. RunSybil provides continuous testing on every deployment, catching vulnerabilities at the commit not after the breach. It reduces time and cost significantly while providing real-time insights. Traditional approaches miss huge chunks of the actual attack surface, while RunSybil provides comprehensive black-box testing without requiring source code access.
Does RunSybil require access to my source code?
No, RunSybil does not require access to source code. It is a black-box testing solution that interacts with systems via their standard interfaces, searching for forgotten endpoints and probing for authentication boundaries. This is a key differentiator from existing tools that rely on static code analysis. The AI agents explore and manipulate live systems the way attackers would.
What types of vulnerabilities can Sybil find?
Sybil finds exploitable vulnerabilities including logic flaws, cross-tenant data access, privilege escalation, transaction manipulation, broken authorization, IAM misconfigurations, container escapes, CI/CD secret exposure, and lateral movement paths. It specifically excels at finding vulnerabilities that only exist where components connect and attack paths that scanners miss. It chains multiple minor vulnerabilities to uncover paths to sensitive data usually overlooked by legacy tools.
How often does RunSybil test my applications?
RunSybil tests on every deployment, providing security feedback with every pull request. The platform continuously re-evaluates your attack surface so your security posture reflects your systems as they exist right now. It doesn't re-run generic checks but evaluates what changed and understands how that change affects your specific attack surface, surfacing only new or newly exploitable risks.
What is the false positive rate compared to other tools?
RunSybil claims to have reduced false positives by 90% compared to standard security scanners. The platform surfaces only findings that matter by using AI reasoning to validate whether vulnerabilities are actually exploitable. Findings come with transparent reasoning behind them and are pre-validated, eliminating the triage burden typical of traditional scanning tools.
Can RunSybil replace my bug bounty program?
Yes, RunSybil can replace bug bounties with continuous coverage across application and infrastructure layers. Bug bounties are expensive and unpredictable, while Sybil provides predictable cost with zero triage burden and pre-validated findings. Point-in-time pentests go stale the moment you ship, but Sybil provides ongoing coverage that gets smarter with every sprint.
How does RunSybil support remediation?
RunSybil supports remediation workflows through vulnerability prioritization, remediation guidance, and mitigation recommendations to help teams address findings efficiently. The attack replay feature allows you to instantly re-test fixes to validate they are effective. The platform provides unlimited retests and the ability to rerun full attack campaigns, with reporting to demonstrate security posture improvements over time.
Who founded RunSybil and what is their background?
RunSybil was founded in 2023 by Ari Herbert-Voss (CEO/Cofounder), the first security hire at OpenAI and core research contributor to GPT-3 and Codex, and Vlad Ionescu (CTO/Cofounder), a Red Teamer at Mandiant and NCC Group who was Offensive Security Tech Lead at Meta and core Llama offensive research lead. The team includes alumni from OpenAI, Meta, Mandiant, NCC Group, and Trail of Bits, with hubs in San Francisco and New York City.
What companies use RunSybil?
RunSybil is trusted by leading organizations including Cursor, Notion Labs, and unnamed Fortune 500 companies. Cursor's CEO Simon Eskildsen called them a world-class partner for ongoing pentesting needs with quick turnaround and attention to detail. These companies report detecting critical flaws that were repeatedly missed by traditional bug bounty hunters and penetration tests.