# Harmonic Security

> Harmonic Security helps enterprises adopt generative AI without leaking sensitive data. Using small, purpose-built language models, its AI Governance and Control platform spots risky prompts, enforces policy across browsers and desktops, and gives security teams visibility into the thousands of AI tools employees quietly use every day.

- **Founded:** 2023
- **Headquarters:** San Francisco, United States (dual HQ with London, UK)
- **Founders:** Alastair Paterson (Co-founder & CEO), Bryan Woolgar-O'Neil (Co-founder & CTO)
- **Team size:** ~68 employees
- **Products:** Harmonic Explore, Harmonic Guide, Harmonic Command
- **Notable:** Raised $24.5M total in under two years, Coverage across 1,000+ AI surfaces including ChatGPT, Claude, Cursor, Canva, Grammarly, Sub-200ms inline policy enforcement

## Products & services

- **Harmonic Explore** — AI usage intelligence and visibility - discover the AI surfaces employees are actually using.
- **Harmonic Guide** — Real-time browser and desktop protection that detects sensitive data in prompts and enforces policy inline.
- **Harmonic Command** — Unified governance plane for humans and AI agents, including MCP servers and embedded tools.

## Achievements

- Raised $24.5M total in under two years
- Coverage across 1,000+ AI surfaces including ChatGPT, Claude, Cursor, Canva, Grammarly
- Sub-200ms inline policy enforcement
- Named among notable AI security startups by Dark Reading and SecurityWeek

## Latest updates

- **2024-10** — Closed $17.5M Series A led by Next47
- **2023-10** — Emerged from stealth with $7M seed led by Ten Eleven Ventures

## Links

- Website: https://harmonic.security
- LinkedIn: https://www.linkedin.com/company/harmonic-security
- Twitter/X: https://twitter.com/harmonicsec

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Profile page: https://yespress.io/harmonic-security
Published by YesPress — https://yespress.io
Last updated: 2026-05-19