Legion Security vs Simbian
Legion Security
Legion Security helps enterprise security teams scale detection, investigation and response using agentic AI. The platform learns from the real workflows security teams already run, across the SOC and beyond, and turns that institutional knowledge into agentic playbooks the team can trust and audit. This lets organisations adopt frontier AI models gradually while preserving operational trust, cutting manual effort and building toward autonomous security capabilities. Rather than depending on API integrations, Legion combines vision models with other methods to observe how practitioners actually work, so teams can codify those processes as they are or optimise them into transparent, inspectable agentic workflows, extending the same approach beyond the SOC to security operations across the enterprise. Legion Security has offices in New York and Tel Aviv and is backed by Coatue, Accel and Picture, with investors from Island, CrowdStrike, Wiz and Google DeepMind. The company was founded in 2024 by former Microsoft Sentinel team members and emerged from stealth in July 2025.
Pros
- Raised $38M total: an $8M seed led by Picture Capital and Accel, and a $30M Series A led by Coatue (Calcalist, Fortune)
- Founding team includes former members of Microsoft's Sentinel product, per Calcalist
- Browser-based deployment is designed to avoid custom API integration work, per the company
- Customers cited on the vendor site report outcomes such as an 81% reduction in MTTI/R (WELL Health Technologies, vendor-cited)
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Simbian
Simbian builds AI agents for security operations. Its AI SOC Agent investigates alerts around the clock, collects evidence on every observable linked to an alert, classifies true and false positives with severity and confidence ratings, and proposes response actions without pre-built playbooks. Companion agents cover threat hunting, penetration testing, network security operations, and GRC questionnaires. The platform deploys as SaaS or on premises and integrates with more than 100 security and enterprise tools.
Pros
- Offers both SaaS and on-premises deployment, which suits environments with data residency constraints (vendor documentation)
- Covers several SecOps functions beyond alert triage, including threat hunting and GRC work, per SecurityWeek's launch coverage
- Designed to integrate with existing tools such as CrowdStrike, Palo Alto, and Cisco rather than replace them (SecurityWeek)
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