CISO Tribune

Vendor comparison · 2 companies

Onyx Security vs WitnessAI

Onyx Security sells a secure control plane for AI agents and models. WitnessAI sells an AI security and governance platform that brings humans and agents under one platform. CISO Tribune files both under AI governance and Workforce AI usage security. This page sets the two records side by side: what each sells, where it is based, who owns and funds it, the customers it names and its recent news, each fact numbered to its source.

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  • Onyx Security
  • WitnessAI
Onyx Security vs WitnessAI: Products, Customers and Funding Compared
Onyx SecurityOnyx Security sells a secure control plane for AI agents and models.onyx.securityWitnessAIWitnessAI sells an AI security and governance platform that brings humans and agents under one platform.witness.ai
What it sells
  • AI Security[1][7]Onyx provides the runtime and posture layer of the Onyx Secure AI Control Plane.
  • MCP Gateway[8]The MCP Gateway governs the agent-to-tool surface.
  • Observe[6][11]Finds and catalogs AI applications, agents and MCP servers, and visualizes AI conversations and agentic activity.
  • Control[1][5][6][7][10][11]Governs what AI agents and employees can do, routes prompts to models based on risk or purpose, and generates audit trails.
  • Protect[1][5][6][8][11]Applies runtime security controls and content guardrails intended to block prompt injection and jailbreak attempts and filter harmful responses.
Categories
Headquarters
Not stated on its pagesMountain View, United States[4]
Founded
Not stated on its pages2023[3]
Ownership and funding
Not stated on its pagesPrivately held[2][13]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
  • July 29, 2026Onyx Security announced a $113 million Series B funding round led by Bessemer Venture Partners.[15]
  • March 12, 2026Onyx Security officially launched operations after securing $40 million in initial funding.[14]
Not stated on its pages
G2 and Gartner Peer Insights
  • G2: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
  • G2: listed, seen November 10, 2026[13]
  • Gartner Peer Insights: Not stated on its pages
Who it fits
From its own pages, Onyx Security sells mainly to security, governance, and AI teams that need control over AI agent adoption across the enterprise. Onyx Security describes a single platform for security, governance, and infrastructure teams. Onyx Security offers cloud, hybrid, or self-hosted options for organisations with sensitive data residency requirements. Onyx Security presents one console for AI agents and models across SaaS, cloud, endpoint, and code environments. Onyx Security names security, finance, and platform teams as the teams that share its usage, cost, and policy ledger.From its own pages, the company sells mainly to enterprises, saying they need security and governance that extends from humans to agents. It addresses employee use of AI, citing risks around sensitive data, compliance, and shadow AI. It also addresses AI agents, which it describes as connecting to tools, accessing data, and taking actions on behalf of employees.
Last verified
October 19, 2026November 2, 2026

Where they overlap

  • Onyx Security and WitnessAI are both filed under AI governance and Workforce AI usage security.

Where they differ, field by field

  • Onyx Security's primary category is AI model and agent security; WitnessAI's is Workforce AI usage security.
  • Onyx Security is also filed under Non-human identity security. WitnessAI is also filed under AI firewalls and guardrails.
  • Onyx Security lists AI Security and MCP Gateway. WitnessAI lists Observe, Control and Protect.
  • WitnessAI is headquartered in Mountain View, United States.
  • WitnessAI was founded in 2023.
  • WitnessAI is privately held.

What it sells: Onyx Security

What AI Security does[1][7]
Onyx provides the runtime and posture layer of the Onyx Secure AI Control Plane. Onyx inspects every prompt, tool call, and model response inline across browser AI, coding assistants, desktop AI agents, cloud workloads, and MCP servers. Onyx offers five enforcement actions: alert, block, mask, steer, or ask.
What MCP Gateway does[8]
The MCP Gateway governs the agent-to-tool surface. Every tool call an agent makes to an MCP server gets inspected and policy-enforced. MCP Gateway coverage spans the MCP ecosystem, including servers using dynamic client registration and popular servers like GitHub.

Questions about Onyx Security and WitnessAI

What do Onyx Security and WitnessAI sell?
Onyx Security sells AI Security and MCP Gateway. WitnessAI sells Observe, Control and Protect.
Are Onyx Security and WitnessAI in the same category?
They share AI governance and Workforce AI usage security. Onyx Security's primary category is AI model and agent security and WitnessAI's is Workforce AI usage security.
Where are Onyx Security and WitnessAI headquartered?
WitnessAI is headquartered in Mountain View, United States.
When were Onyx Security and WitnessAI founded?
WitnessAI was founded in 2023.
Who owns Onyx Security and WitnessAI?
WitnessAI is privately held.
Who are Onyx Security and WitnessAI sold to?
From its own pages, Onyx Security sells mainly to security, governance, and AI teams that need control over AI agent adoption across the enterprise. From its own pages, the company sells mainly to enterprises, saying they need security and governance that extends from humans to agents.
What have Onyx Security and WitnessAI announced recently?
July 29, 2026: Onyx Security announced a $113 million Series B funding round led by Bessemer Venture Partners.

About Onyx Security

Onyx Security sells a secure control plane for AI agents and models. Onyx gives security, governance, and AI teams control to protect, optimize, and measure AI agent adoption across the enterprise. Onyx was founded around a single goal: to control the most advanced forms of AI. Onyx describes its secure AI control plane as a single platform that serves security, governance, and infrastructure teams as they oversee how AI agents are used, ensure they are secure and compliant, and measure their effectiveness.[1][2]

Onyx says enterprises were deploying autonomous agents faster than they could see, govern, or control them. Onyx offers one console for every AI agent and model across SaaS, cloud, endpoint, and code. Onyx discovers sanctioned and shadow AI across the enterprise, with visibility into every prompt, response, and agent action. Onyx identifies every agent, MCP server, AI tool, copilot, and embedded AI surface continuously, across SaaS, cloud, endpoints, and code. Onyx combines directory scanning, native platform APIs, and behavioral signature learning for browser-based AI to keep the inventory current. Onyx records every prompt, model response, and tool call by name, argument, and result, with the reasoning context preserved across turns. Onyx correlates agent activity to the invoking user and the agent owner, and captures the identity used on each tool and MCP call. Onyx forwards alerts and their session records to Splunk and CrowdStrike NG-SIEM.[1][2][4][5][8]

Onyx provides the runtime and posture layer of the Onyx Secure AI Control Plane. Onyx inspects every prompt, tool call, and model response inline across browser AI, coding assistants, desktop AI agents, cloud workloads, and MCP servers. Onyx applies five enforcement actions: alert, block, mask, steer, or ask (human in-the-loop). Onyx evaluates every agent on deployment and continuously across its lifecycle. Onyx red teaming continuously attacks deployed agents, generating attack plans across reconnaissance, jailbreaking, and weaponization. Onyx identifies supply chain risks in agents, MCP servers, models, and AI assets.[4][6]

Onyx gives an agent its own identity, separate from the invoker, when multiple users delegate to the same agent across tools. Onyx lets teams sanction approved tools and control MCP server access. Onyx offers pre-populated policy templates aligned to industry regulations. Onyx helps teams meet security standards from MITRE, NIST, OWASP, and more.[4][7]

Onyx centralizes all AI traffic on a fully-managed, OSS AI gateway. Onyx routes across popular LLMs to automate failover, minimize latency, and balance load by task complexity and cost constraints. Onyx proxies all MCP traffic with an inline gateway, logs every request and response, and enforces guardrails. Onyx evaluates every tool call an agent makes to an MCP server against scope, identity, data class, and policy before the call lands.[4][8]

Onyx lets teams define AI adoption targets by department, use case, or tool category. Onyx shows total AI spend, avoidable costs, and optimization opportunities. Onyx correlates AI usage, cost, risk, and outcomes to the same activity record. The Onyx AI Gateway captures per-request cost metadata at runtime: cost, tokens, model, and identity context. The Onyx Guardian Agent is a supervisory AI that continuously works across the platform to identify risks and remediate issues.[2][4][9]

Onyx offers cloud, hybrid, or self-hosted options for sensitive data residency requirements. Onyx supports deployment with AWS VPC, Bedrock Gateway, and custom proxy configurations. Onyx offers 100+ pre-built integrations that connect to agent platforms, frontier model providers, SIEM, and cloud platforms. Onyx pulls identity context from Okta and Microsoft Entra, and endpoint management context from Intune, Jamf, and Tanium. Onyx integrates with Claude Enterprise through the Compliance API, pulling conversation content, uploaded files, project data, and activity logs into the Onyx control plane. Onyx integrates with the OpenAI Compliance API, ingesting ChatGPT Enterprise workspace activity. Onyx integrates with Amazon Bedrock Agents through Bedrock Agent configuration APIs, agent invocation logs delivered to S3, and CloudTrail data events. Onyx integrates with Microsoft Copilot Studio through the Microsoft Graph API. Onyx Security is SOC 2 Type II and ISO 27001 certified.[1][4][6][7][8][10][11][12][13]

Onyx Security on the record

Sources

Onyx Security full record

  1. [1]onyx.securityOnyx Security · onyx.security · undated page, accessed October 19, 2026 · Tier A
  2. [2]The Secure AI Control Plane for the Agentic Era | OnyxOnyx Security · undated page, accessed November 10, 2026 · Tier A
  3. [3]About Onyx | The Team Behind the AI Control PlaneOnyx Security · undated page, accessed November 10, 2026 · Tier A
  4. [4]One Platform to Discover and Control Every AI Agent | OnyxOnyx Security · undated page, accessed November 10, 2026 · Tier A
  5. [5]AI Observability – Discover Every Agent & Session | OnyxOnyx Security · undated page, accessed November 10, 2026 · Tier A
  6. [6]AI Agent Security | Block Prompt Injection in Real TimeOnyx Security · undated page, accessed November 10, 2026 · Tier A
  7. [7]AI Governance Platform Built for the EU AI Act | OnyxOnyx Security · undated page, accessed November 10, 2026 · Tier A
  8. [8]AI Orchestration – Governed Routing & Control | OnyxOnyx Security · undated page, accessed November 10, 2026 · Tier A
  9. [9]AI ROI Platform – Prove Value & Control Costs | OnyxOnyx Security · undated page, accessed November 10, 2026 · Tier A
  10. [10]Secure Claude Enterprise with Onyx | Anthropic IntegrationOnyx Security · undated page, accessed November 10, 2026 · Tier A
  11. [11]Secure ChatGPT Enterprise with Onyx | OpenAI IntegrationOnyx Security · undated page, accessed November 10, 2026 · Tier A
  12. [12]Secure Amazon Bedrock Agents | Onyx IntegrationOnyx Security · undated page, accessed November 10, 2026 · Tier A
  13. [13]Copilot Studio Security – Discover, Govern & Control | OnyxOnyx Security · undated page, accessed November 10, 2026 · Tier A
  14. [14]Israeli cyber firm Onyx Security launches operations with $40 million funding round | ReutersReuters · published March 12, 2026 · Tier B
  15. [15]Onyx Security Raises $113M Series B to Control Advanced AI, Quadrupling Revenue since Stealth Launch Four Months AgoBusiness Wire · published July 29, 2026 · Tier A

WitnessAI full record

  1. [1]Unified AI Security and Governance Platform | WitnessAIWitnessAI · undated page, accessed September 27, 2026 · Tier A
  2. [2]Witnessai raises 58 million for global expansion and announces new ways to secure ai agents 302659319WitnessAI via PR Newswire · prnewswire.com · published January 13, 2026 · Tier A
  3. [3]Witnessai launches with guardrails for aiDark Reading · darkreading.com · published May 21, 2024 · Tier B
  4. [4]WitnessaiAppSec Santa · appsecsanta.com · published April 3, 2026 · Tier C
  5. [5]Scaling AI Security with WitnessAI - WitnessAIWitnessAI · undated page, accessed November 10, 2026 · Tier A
  6. [6]AI Security Platform | Enterprise AI Governance | WitnessAIWitnessAI · undated page, accessed November 10, 2026 · Tier A
  7. [7]WitnessAI 2.0 Delivers New Regulatory Compliance Capabilities to Support Safe AI Adoption - WitnessAIWitnessAI · published April 30, 2025 · Tier A
  8. [8]Ensuring Compliance with the EU AI Act - WitnessAIWitnessAI · undated page, accessed November 10, 2026 · Tier A
  9. [9]WitnessAI Achieves SOC 2 Type II Compliance - WitnessAIWitnessAI · published October 21, 2025 · Tier A
  10. [10]WitnessAI Joins ServiceNow Control Tower Alliance - WitnessAIWitnessAI · undated page, accessed November 10, 2026 · Tier A
  11. [11]TENEX.AI and WitnessAI Partner to Deliver Managed Security and Compliance Services for Enterprise AI - WitnessAIWitnessAI · published June 17, 2025 · Tier A
  12. [12]How Security Leaders Prove ROI and Reduce Risk - WitnessAIWitnessAI · undated page, accessed November 10, 2026 · Tier A
  13. [13]WitnessAI Reviews 2026: Details, Pricing, & FeaturesG2 · undated page, accessed November 10, 2026 · Tier C

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