Legion Security vs Simbian
Legion Security
Legion Security offers an agentic AI security operations platform that deploys through the analyst's browser rather than through API integrations. The system observes analyst investigations, playbooks and past cases in a learning mode, then executes workflows in the browser with human oversight (companion mode) or with reduced intervention (autonomous mode). Press coverage describes it as a browser extension AI SOC companion that works across tools such as Chrome, Edge and Island. 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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