CISO Tribune

Vendor comparison · 2 companies

Pillar Security vs Prompt Security

Pillar Security sells one platform to discover, test, secure and govern every AI agent across an organization. Prompt Security offers protection for both employee use of AI tools and the apps an organization builds. CISO Tribune files both under AI model and agent security, AI firewalls and guardrails 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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  • Pillar Security
  • Prompt Security
Pillar Security vs Prompt Security: Products, Customers and Funding Compared
Pillar SecurityPillar Security sells one platform to discover, test, secure and govern every AI agent across an organization.pillar.securityPrompt SecurityPrompt Security offers protection for both employee use of AI tools and the apps an organization builds.prompt.security
What it sells
  • Agentic Endpoint[7][10]Protects the AI agents that run on employee machines.
  • Prompt Fuzzer[4]An open source tool for AI vulnerability assessment.
Categories
Headquarters
Not stated on its pagesNot stated on its pages
Founded
Not stated on its pages2023[1]
Ownership and funding
Owned by VantaOwned by SentinelOne since 2025[3][7][8][10]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
  • November 9, 2026Vanta signed a definitive agreement to acquire Pillar Security, an AI security platform that protects AI agents across their lifecycle.[11]
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[10]
  • Gartner Peer Insights: Not stated on its pages
Who it fits
Not written yetNot written yet
Last verified
November 10, 2026September 27, 2026

Where they overlap

  • Pillar Security and Prompt Security are both filed under AI model and agent security, AI firewalls and guardrails and Workforce AI usage security.

Where they differ, field by field

  • Pillar Security's primary category is AI model and agent security; Prompt Security's is AI firewalls and guardrails.
  • Pillar Security is also filed under AI governance.
  • Pillar Security lists Agentic Endpoint. Prompt Security lists Prompt Fuzzer.
  • Prompt Security was founded in 2023.
  • Pillar Security is owned by Vanta. Prompt Security is owned by SentinelOne, since 2025.

What it sells: Pillar Security

What Agentic Endpoint does[7][10]
Pillar deploys through an MDM and inventories the AI coding agents across a fleet: which agents run where, their versions, sandbox state and risk. Runtime Guardian sits in the agent's own pre-tool hook for Claude Code, Codex CLI and Cursor, and decides on every action before it runs. Pillar inventories local and remote servers across a fleet and scores each against a catalog of 23,000+ pre-analyzed servers.

What it sells: Prompt Security

What Prompt Fuzzer does[4]
Prompt Fuzzer is listed under AI Security Tools on the Prompt Security site. The site describes it as an open source tool for AI vulnerability assessment.

Questions about Pillar Security and Prompt Security

What do Pillar Security and Prompt Security sell?
Pillar Security sells Agentic Endpoint. Prompt Security sells Prompt Fuzzer.
Are Pillar Security and Prompt Security in the same category?
They share AI model and agent security, AI firewalls and guardrails and Workforce AI usage security. Pillar Security's primary category is AI model and agent security and Prompt Security's is AI firewalls and guardrails.
When were Pillar Security and Prompt Security founded?
Prompt Security was founded in 2023.
Who owns Pillar Security and Prompt Security?
Pillar Security is owned by Vanta. Prompt Security is owned by SentinelOne, since 2025.
What have Pillar Security and Prompt Security announced recently?
November 9, 2026: Vanta signed a definitive agreement to acquire Pillar Security, an AI security platform that protects AI agents across their lifecycle.

About Pillar Security

Pillar Security sells one platform to discover, test, secure and govern every AI agent across an organization. Pillar catalogs AI agents, models, prompts, frameworks, tools, MCP servers, skills and coding agents through agentless integrations. The catalog covers shadow AI and unapproved systems deployed without oversight. Pillar maps instructions, data sources, tool permissions, and external connections for each agent. Pillar traces dependencies across models and agent harness and scans agent configs, permissions, and identities.[1][2][3][4]

For discovery, Pillar works through agentless integrations with source code repos, data platforms, and endpoints. Pillar assesses risks in AI stacks from vulnerabilities in models, frameworks, and dependencies. Pillar flags violations when unsanctioned AI appears in an environment. Pillar policy rules enforce approved models, frameworks, and data sovereignty standards across an AI stack. Pillar generates audit reports for GDPR, SOC 2, EU AI Act, and ISO 42001.[4]

For testing, Pillar executes multi-turn adversarial attacks against complete AI systems to test tool orchestration, permission escalation, and agentic workflows. Pillar maps an AI attack surface as a graph showing relationships between agents, tools, permissions, and data sources. RedGraph maps how tools, prompts, and data combine to create exploitable surfaces specific to an environment. Pillar tests AI platforms, third-party agents, and production systems that a customer does not own or control through multi-step black box adversarial attacks against prompts, tools, and workflows. Pillar documents exploitability with attack transcripts, recordings and reproduction steps, and feeds validated findings into adaptive guardrails.[2][3][5]

For runtime protection, Pillar analyzes user and agent intent to detect malicious behavior before it impacts production. Pillar identifies PII, PHI, secrets, and credentials flowing through AI interactions in real time. Pillar applies configurable policies to mask, block, or log sensitive data before exposure to AI models or external systems. Pillar guardrails calibrate using red teaming findings from specific applications to tune protection against the manipulation patterns detected during testing. Pillar logs prompts, responses, tool invocations, and results with timestamps. Pillar streams telemetry to security platforms for centralized monitoring.[6]

For developer machines, Pillar deploys through an MDM and inventories the AI coding agents across a fleet: which agents run where, their versions, sandbox state and risk. Pillar runs full configuration scans for Claude Code, Cursor, Codex CLI, Gemini CLI, OpenCode and Pi Coding Agent, and detects other agents such as Amazon Q, Antigravity, Codeium and OpenClaw by fingerprint. Runtime Guardian sits in the agent's own pre-tool hook for Claude Code, Codex CLI and Cursor, and decides on every action before it runs. Pillar inventories local and remote servers across a fleet and scores each against a catalog of 23,000+ pre-analyzed servers. Pillar rolls out through Jamf Pro, Kandji, JumpCloud or any MDM that runs scripts, on macOS, Linux and Windows. On endpoints, Pillar analyzes permissions, credentials, access scopes, and auto-run settings, then provides step-by-step remediation. At runtime, Pillar monitors every prompt, tool call, and command to detect prompt injection, tool poisoning, and data exfiltration.[7][8]

For governance, Pillar translates governance policies into technical controls that enforce approved models, licensing standards, and data sovereignty requirements at every stage. Pillar extends governance controls to external AI providers, SaaS platforms, and vendor integrations. Pillar maps governance findings, testing results, and runtime logs to regulatory requirements automatically. Pillar adds a security enforcement layer on AI gateway frameworks without re-architecting a stack. Pillar inspects every prompt and response in real time for sensitive data exposure, prompt injection, toxic content, and policy violations. For tool integrations, Pillar validates at runtime that tool calls match their declared schemas and flags anomalous behavior, like a tool accessing resources outside its expected scope.[8][9]

Pillar can be deployed in its managed cloud, in a customer's own cloud account or data center, or as a mix of both. Self-hosted deployments include runtime guardrails, AI discovery, red teaming and agentic endpoint security. Adaptive guardrails are available in the managed cloud only today. Telemetry back to Pillar is off unless the customer enables it. A Fortune 300 manufacturer runs Pillar fully self-hosted. Pillar cites SOC 2 Type II and ISO/IEC 27001:2022.[1][6][7][8][10]

Pillar Security on the record

Sources

Pillar Security full record

  1. [1]pillar.securityPillar Security · pillar.security · undated page, accessed November 10, 2026 · Tier A
  2. [2]Pillar Security | Securing the Agentic WorkforcePillar Security · undated page, accessed November 11, 2026 · Tier A
  3. [3]Pillar Security Platform | Securing the Entire AI Software LifecyclePillar Security · undated page, accessed November 11, 2026 · Tier A
  4. [4]AI Discovery & Posture | Pillar SecurityPillar Security · undated page, accessed November 11, 2026 · Tier A
  5. [5]AI Red Teaming & Risk Detection | Pillar SecurityPillar Security · undated page, accessed November 11, 2026 · Tier A
  6. [6]AI Runtime Guardrails | Pillar SecurityPillar Security · undated page, accessed November 11, 2026 · Tier A
  7. [7]Agentic Endpoint: Secure AI Coding Agents | Pillar SecurityPillar Security · undated page, accessed November 11, 2026 · Tier A
  8. [8]AI Security Solutions | Pillar SecurityPillar Security · undated page, accessed November 11, 2026 · Tier A
  9. [9]AI Governance & Compliance | Pillar SecurityPillar Security · undated page, accessed November 11, 2026 · Tier A
  10. [10]Deployment Options: Cloud, Self-Hosted, Hybrid · PillarPillar Security · undated page, accessed November 11, 2026 · Tier A
  11. [11]Vanta to Acquire Pillar Security to Turn AI Policy Into PracticeBusiness Wire · published November 9, 2026 · Tier A

Prompt Security full record

  1. [1]Prompt security partners with f5 to secure genai applications with a firewall for ai 302131373Prompt Security via PR Newswire · prnewswire.com · published April 30, 2024 · Tier A
  2. [2]Securing ai promptSentinelOne · sentinelone.com · undated page, accessed September 27, 2026 · Tier A
  3. [3]Sentinelone completes acquisition of prompt securitySentinelOne via The Globe and Mail · theglobeandmail.com · published September 5, 2025 · Tier A
  4. [4]Prompt Security | From SentinelOnePrompt Security · undated page, accessed October 27, 2026 · Tier A
  5. [5]AI Security | AI Glossary | Prompt SecurityPrompt Security · undated page, accessed October 27, 2026 · Tier A
  6. [6]ClawSec: A Security Skill Suite for OpenClaw AgentsPrompt Security · undated page, accessed October 27, 2026 · Tier A
  7. [7]AI Security Startups Map — Agentic AI Vendors by CategoryPrompt Security · undated page, accessed October 27, 2026 · Tier A
  8. [8]About this Map & Methodology — AI Security Startups MapPrompt Security · undated page, accessed October 27, 2026 · Tier A
  9. [9]OneClaw DashboardPrompt Security · undated page, accessed November 10, 2026 · Tier A
  10. [10]Prompt Security Pros and Cons | User Likes & DislikesG2 · undated page, accessed November 10, 2026 · Tier C

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