CISO Tribune

Vendor comparison · 2 companies

Onyx Security vs Salt Security

Onyx Security sells a secure control plane for AI agents and models. Salt Security provides security for the APIs, MCP servers and data infrastructure where agents execute. CISO Tribune files both under AI model and agent 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
  • Salt Security
Onyx Security vs Salt Security: Products, Customers and Funding Compared
Onyx SecurityOnyx Security sells a secure control plane for AI agents and models.onyx.securitySalt SecuritySalt Security provides security for the APIs, MCP servers and data infrastructure where agents execute.salt.security
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.
  • Agentic Security Graph[4][8]Maps and correlates the full environment out-of-band.
  • Salt Surface[5][9]Provides agentless, outside-in discovery of MCP servers and APIs.
  • Salt Connect[5][9]Provides cloud and code inventory.
Categories
Headquarters
Not stated on its pagesPalo Alto, United States[1][3]
Founded
Not stated on its pages2016[1][11]
Ownership and funding
Not stated on its pagesNot stated on its pages
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]
  • June 1, 2026Salt Security launched Salt Code, a component that enforces security policies on AI-generated code across the development lifecycle.[17]
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[7]
  • 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 shows an industry solution for Finance, described as stop fraud and abuse. It lists one for Healthcare, described as HIPPAA-grade protection. Transportation is also listed, with secure logistics APIs. Retail is listed, with protect PII at scale. Software is listed, with API-first app security. Its whitepaper page also says security teams face a challenge in which the action layer goes unmonitored.
Last verified
October 19, 2026September 27, 2026

Where they overlap

  • Onyx Security and Salt Security are both filed under AI model and agent security.

Where they differ, field by field

  • Onyx Security's primary category is AI model and agent security; Salt Security's is API security.
  • Onyx Security is also filed under AI governance, Workforce AI usage security and Non-human identity security.
  • Onyx Security lists AI Security and MCP Gateway. Salt Security lists Agentic Security Graph, Salt Surface and Salt Connect.
  • Salt Security is headquartered in Palo Alto, United States.
  • Salt Security was founded in 2016.

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.

What it sells: Salt Security

What Agentic Security Graph does[4][8]
Salt's Agentic Security Graph maps and correlates the full environment out-of-band. Salt describes its agentic security platform as one graph of agents, the MCP servers they use and the APIs they call, with the context behind each one.
What Salt Surface does[5][9]
Salt Surface provides agentless, outside-in discovery of MCP servers and APIs. Salt Surface discovers these from the outside, without an agent.
What Salt Connect does[5][9]
Salt Connect provides cloud and code inventory. Salt names Salt Connect together with collectors that are used where runtime analysis is needed.

Questions about Onyx Security and Salt Security

What do Onyx Security and Salt Security sell?
Onyx Security sells AI Security and MCP Gateway. Salt Security sells Agentic Security Graph, Salt Surface and Salt Connect.
Are Onyx Security and Salt Security in the same category?
They share AI model and agent security. Onyx Security's primary category is AI model and agent security and Salt Security's is API security.
Where are Onyx Security and Salt Security headquartered?
Salt Security is headquartered in Palo Alto, United States.
When were Onyx Security and Salt Security founded?
Salt Security was founded in 2016.
Who are Onyx Security and Salt Security 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 shows an industry solution for Finance, described as stop fraud and abuse.
What have Onyx Security and Salt Security announced recently?
July 29, 2026: Onyx Security announced a $113 million Series B funding round led by Bessemer Venture Partners. June 1, 2026: Salt Security launched Salt Code, a component that enforces security policies on AI-generated code across the development lifecycle.

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

Salt Security full record

  1. [1]Salt security raises 140 million series d round led by capitalg at 1 4 billion valuationSalt Security · salt.security · undated page, accessed September 27, 2026 · Tier A
  2. [2]Salt security extends its agentic security platform with native ai detection and responseSalt Security · salt.security · published September 22, 2026 · Tier A
  3. [3]Contact usSalt Security · salt.security · undated page, accessed September 27, 2026 · Tier A
  4. [4]The Agentic Security Graph: A New Framework for the AI EraSalt Security · undated page, accessed October 28, 2026 · Tier A
  5. [5]Salt Security: Agentic AI Security, MCP Discovery, and API SecuritySalt Security · undated page, accessed October 28, 2026 · Tier A
  6. [6]EU AI Act Compliance 2026: What High-risk AI Systems Must Do Now | Salt SecuritySalt Security · undated page, accessed October 28, 2026 · Tier A
  7. [7]Salt Security Reviews & Product Details - G2G2 · undated page, accessed October 28, 2026 · Tier C
  8. [8]Onyx Security vs Salt Security | Secure the Agentic Action LayerSalt Security · undated page, accessed November 10, 2026 · Tier A
  9. [9]Securing APIs - API Attack Surface Management SolutionSalt Security · undated page, accessed November 10, 2026 · Tier A
  10. [10]Salt Security Master Services AgreementSalt Security · published May 20, 2026 · Tier A
  11. [11]API Security Company - About Us Salt Security API SecuritySalt Security · undated page, accessed November 10, 2026 · Tier A
  12. [12]Agentic Security Platform - Complete AI & API Protection PlatformSalt Security · undated page, accessed November 10, 2026 · Tier A
  13. [13]API Security Software - API Security Management SoftwareSalt Security · undated page, accessed November 10, 2026 · Tier A
  14. [14]Proactive API Security - “Shift Left" API DevelopmentSalt Security · undated page, accessed November 10, 2026 · Tier A
  15. [15]API Security Customers - Salt Security CustomersSalt Security · undated page, accessed November 10, 2026 · Tier A
  16. [16]API Security Trends - API Attacks, Breaches & Threats ReportSalt Security · undated page, accessed November 10, 2026 · Tier A
  17. [17]Salt Security launches Salt CodeSalt Security · published June 1, 2026 · Tier A

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