CISO Tribune

Vendor comparison · 2 companies

Prime Security vs Promptfoo

Prime Security sells an AI security review platform designed for software development lifecycles. Promptfoo builds open-source tools for secure, reliable AI applications. CISO Tribune files both under Static application security testing and Breach simulation and automated pen-testing. 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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  • Prime Security
  • Promptfoo
Prime Security vs Promptfoo: Products, Customers and Funding Compared
Prime SecurityPrime Security sells an AI security review platform designed for software development lifecycles.primesec.aiPromptfooPromptfoo builds open-source tools for secure, reliable AI applications.promptfoo.dev
What it sells
  • Autonomous Design Reviews[1][4]AI agents review specs, architecture and data flows to uncover security risks before code is written.
  • Red Teaming[2][4][5]Simulates real users to uncover application-specific vulnerabilities.
  • Evaluations[2][5]LLM evaluation of prompts and models that can run inside CI workflows.
Categories
Headquarters
Not stated on its pagesSan Francisco, United States[1][3]
Founded
Not stated on its pages2024[1][12]
Ownership and funding
Not stated on its pagesOwned by OpenAI[12]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
  • December 9, 2025Prime Security said it raised $20 million in early-stage funding to fuel go-to-market expansion and its Agentic Product Security Platform.[11]
  • March 9, 2026OpenAI agreed to buy Promptfoo, a startup helping businesses find and fix security issues in AI models during development.[13]
  • March 9, 2026OpenAI announced it has acquired Promptfoo, an AI security startup founded in 2024 to protect LLMs from adversarial attacks.[12]
G2 and Gartner Peer Insights
  • G2: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
  • G2: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
Who it fits
Not written yetNot written yet
Last verified
November 9, 2026November 4, 2026

Where they overlap

  • Prime Security and Promptfoo are both filed under Static application security testing and Breach simulation and automated pen-testing.

Where they differ, field by field

  • Prime Security's primary category is Application security posture management; Promptfoo's is AI model and agent security.
  • Prime Security is also filed under Software supply chain security. Promptfoo is also filed under AI firewalls and guardrails.
  • Prime Security lists Autonomous Design Reviews. Promptfoo lists Red Teaming and Evaluations.
  • Promptfoo is headquartered in San Francisco, United States.
  • Promptfoo was founded in 2024.
  • Promptfoo is owned by OpenAI.

What it sells: Prime Security

What Autonomous Design Reviews does[1][4]
Prime checks every design, scores every risk and validates every fix in code. Prime can produce a threat model and combines design-level analysis with actual code.

What it sells: Promptfoo

What Red Teaming does[2][4][5]
Promptfoo creates thousands of context-aware attacks tailored to the customer's application. The open-source Community version includes up to 10k probes per month at no charge.
What Evaluations does[2][5]
Promptfoo's LLM evaluation can be integrated into a CircleCI pipeline. Promptfoo can be integrated with test frameworks like Jest and Vitest to evaluate prompts as part of existing testing and CI workflows. Promptfoo provides real-time alerts and automated evaluations to show LLM security status across all projects.

Questions about Prime Security and Promptfoo

What do Prime Security and Promptfoo sell?
Prime Security sells Autonomous Design Reviews. Promptfoo sells Red Teaming and Evaluations.
Are Prime Security and Promptfoo in the same category?
They share Static application security testing and Breach simulation and automated pen-testing. Prime Security's primary category is Application security posture management and Promptfoo's is AI model and agent security.
Where are Prime Security and Promptfoo headquartered?
Promptfoo is headquartered in San Francisco, United States.
When were Prime Security and Promptfoo founded?
Promptfoo was founded in 2024.
Who owns Prime Security and Promptfoo?
Promptfoo is owned by OpenAI.
What have Prime Security and Promptfoo announced recently?
December 9, 2025: Prime Security said it raised $20 million in early-stage funding to fuel go-to-market expansion and its Agentic Product Security Platform. March 9, 2026: OpenAI agreed to buy Promptfoo, a startup helping businesses find and fix security issues in AI models during development.

About Prime Security

Prime Security sells an AI security review platform designed for software development lifecycles. Prime Agents learn an organisation's architecture, code and risk history. Prime Security describes one platform covering the SDLC before the code, in the code and after the code. Prime agents work autonomously inside the customer environment, mapping every application, policy, resource and data flow. Prime agents live inside the development lifecycle and understand designs, code, cloud and policies.[1][2][3][4]

Prime Security says AI agents, multiple stacks and complex development processes have created an attack surface that no existing security tool was built to handle. Prime Security states its aim as connecting architecture, code and cloud to find every exploitable attack vector before attackers do. Prime tracks every asset as it moves from design to deployment. Prime learns an organisation's architecture, past decisions and risk profile, and each review builds on the last one.[3][4][5]

Autonomous design reviews use AI agents to review specs, architecture and data flows to uncover security risks before code is written. Prime checks every design, scores every risk and validates every fix in code. Prime can produce a threat model, and Prime combines design-level analysis with actual code. Prime Security covers architecture reviews, threat modeling, documentation analysis, and security analysis tied to tickets and code changes. Prime finds vulnerabilities and logic flaws in AI-generated and human-written code. Prime checks every PR the moment it opens, whether a developer or an agent wrote it. Prime checks each pull request for approved auth flows, encryption methods, architecture patterns and framework requirements. Prime reviews every PR against the policies that apply to that repo, validates each finding and hands the agent the context to fix it. Prime logs every review, finding, validation and fix.[1][2][3][4][6]

Prime sets security guardrails for agents like Cursor and Claude Code, catching insecure code at the PR before it merges. Prime Security embeds security policies directly into AI coding workflows. Prime inventories every package in the dependency graph, direct and transitive, and matches it against known CVEs and the license policy. Prime identifies vulnerable packages accessible to attackers with proven attack paths. Exploitable findings arrive with the full attack path, and unreachable ones arrive marked as noise, with the reasoning attached. Prime checks every dependency against the license policy in the same scan. Prime runs continuous attack path analysis with source, architecture and controls. Prime maps how services talk, where data flows and how an attacker would chain it all together. Prime evaluates multi-step attacks the way an attacker plans them.[1][3][4][7]

Prime delivers a tailored fix wherever the work happens, with the PR, Slack or a Jira ticket for developers. For dev agents, Prime delivers context over MCP, so mitigation runs with no human in the loop. Prime proposes mitigations built for the codebase, delivers them to developers and agents and validates the fix landed in code. Agents run continuously across planning and development workflows without requiring custom engineering from the customer team. Prime integrates with Github, Gitlab, Claude Code, Cursor, Jira, Confluence, Google Drive, Azure DevOps, Linear, and Git Issues.[2][3][4]

Prime Security supports Product Security Engineers and Security Architects. MX adopted Prime Security. MX is a financial data platform that powers secure data access, analytics, and personalized money experiences for banks, fintechs, and financial institutions. Oscar Health adopted Agentic Security Architect from Prime to automate security reviews and proactively identify risk across all engineering work. Oscar Health is a healthcare technology company that combines digital experiences with health insurance services. ThoughtSpot adopted Agentic Security Architect from Prime to scale security reviews and threat modeling across its expanding engineering surface area. ThoughtSpot is an analytics platform that enables organizations to explore, analyze, and act on data at scale.[1][4][8][9][10]

Prime Security on the record

Sources

Prime Security full record

  1. [1]primesec.aiPrimeSec Inc. · primesec.ai · undated page, accessed November 9, 2026 · Tier A
  2. [2]Build vs Buy: Automating Security Design Reviews at Scale | Prime SecurityPrime Security · undated page, accessed November 10, 2026 · Tier A
  3. [3]Prime Security | Agentic Product Security PlatformPrime Security · undated page, accessed November 10, 2026 · Tier A
  4. [4]Prime Security Platform | AI Agents for Product SecurityPrime Security · undated page, accessed November 10, 2026 · Tier A
  5. [5]About Prime Security | Agentic AI Security CompanyPrime Security · undated page, accessed November 10, 2026 · Tier A
  6. [6]AI Security Code Reviews | Prime SecurityPrime Security · undated page, accessed November 10, 2026 · Tier A
  7. [7]Supply Chain Security | Prime SecurityPrime Security · undated page, accessed November 10, 2026 · Tier A
  8. [8]How MX Used Prime to Scale Product Security Without Adding HeadcountPrime Security · undated page, accessed November 10, 2026 · Tier A
  9. [9]How Oscar Health Scaled Secure Development and Risk Prioritization Across EngineeringPrime Security · undated page, accessed November 10, 2026 · Tier A
  10. [10]How ThoughtSpot Scaled Security Coverage and Confidence in a High-Velocity Engineering EnvironmentPrime Security · undated page, accessed November 10, 2026 · Tier A
  11. [11]Prime Security raises $20M early-stage funding to scale its agentic product security platform - SiliconANGLESiliconANGLE · published December 9, 2025 · Tier B

Promptfoo full record

  1. [1]PressPromptfoo · promptfoo.dev · undated page, accessed November 4, 2026 · Tier A
  2. [2]promptfoo.devPromptfoo · promptfoo.dev · undated page, accessed November 4, 2026 · Tier A
  3. [3]About Promptfoo | AI Security Experts | PromptfooPromptfoo · undated page, accessed November 10, 2026 · Tier A
  4. [4]Build Secure AI Applications | PromptfooPromptfoo · undated page, accessed November 10, 2026 · Tier A
  5. [5]Pricing | PromptfooPromptfoo · undated page, accessed November 10, 2026 · Tier A
  6. [6]Setting up Promptfoo with CircleCI | PromptfooPromptfoo · undated page, accessed November 10, 2026 · Tier A
  7. [7]Testing prompts with Jest and Vitest | PromptfooPromptfoo · undated page, accessed November 10, 2026 · Tier A
  8. [8]Finding LLM Jailbreaks with Burp Suite | PromptfooPromptfoo · undated page, accessed November 10, 2026 · Tier A
  9. [9]SharePoint Integration | PromptfooPromptfoo · undated page, accessed November 10, 2026 · Tier A
  10. [10]Langfuse integration | PromptfooPromptfoo · undated page, accessed November 10, 2026 · Tier A
  11. [11]AI Security for Real Estate | PromptfooPromptfoo · undated page, accessed November 10, 2026 · Tier A
  12. [12]OpenAI acquires Promptfoo to secure its AI agents | TechCrunchTechCrunch · published March 9, 2026 · Tier B
  13. [13]OpenAI Buying AI Security Startup Promptfoo to Safeguard AI Agents - BloombergBloomberg · published March 9, 2026 · Tier B

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