CISO Tribune

Vendor comparison · 2 companies

Promptfoo vs Stream.Security

Promptfoo builds open-source tools for secure, reliable AI applications. Stream.Security sells an AI-First platform built to fight AI-enabled attacks. 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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  • Promptfoo
  • Stream.Security
Promptfoo vs Stream.Security: Products, Customers and Funding Compared
PromptfooPromptfoo builds open-source tools for secure, reliable AI applications.promptfoo.devStream.SecurityStream.Security sells an AI-First platform built to fight AI-enabled attacks.stream.security
What it sells
  • 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.
  • ProductionTwin[4]Computes the current state, structure and dependencies of a production estate as one connected system.
Categories
Headquarters
San Francisco, United States[1][3]Tel Aviv, Israel[3]
Founded
2024[1][12]Not stated on its pages
Ownership and funding
Owned by OpenAI[12]Privately held[2][4]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
  • 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]
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: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
Who it fits
Not written yetNot written yet
Last verified
November 4, 2026November 2, 2026

Where they overlap

  • Promptfoo and Stream.Security are both filed under AI model and agent security.

Where they differ, field by field

  • Promptfoo's primary category is AI model and agent security; Stream.Security's is Cloud detection and response.
  • Promptfoo is also filed under AI firewalls and guardrails, Static application security testing and Breach simulation and automated pen-testing.
  • Promptfoo lists Red Teaming and Evaluations. Stream.Security lists ProductionTwin.
  • Promptfoo is headquartered in San Francisco, United States. Stream.Security is headquartered in Tel Aviv, Israel.
  • Promptfoo was founded in 2024.
  • Promptfoo is owned by OpenAI. Stream.Security is privately held.

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.

What it sells: Stream.Security

What ProductionTwin does[4]
ProductionTwin continuously computes the current state, structure and dependencies of cloud, SaaS, identity, runtime, AI, network, perimeter, on-prem and security controls as one connected system. Stream continuously models cloud environments as they change, unifying configurations, identities, behaviors, and activity.

Questions about Promptfoo and Stream.Security

What do Promptfoo and Stream.Security sell?
Promptfoo sells Red Teaming and Evaluations. Stream.Security sells ProductionTwin.
Are Promptfoo and Stream.Security in the same category?
They share AI model and agent security. Promptfoo's primary category is AI model and agent security and Stream.Security's is Cloud detection and response.
Where are Promptfoo and Stream.Security headquartered?
Promptfoo is headquartered in San Francisco, United States. Stream.Security is headquartered in Tel Aviv, Israel.
When were Promptfoo and Stream.Security founded?
Promptfoo was founded in 2024.
Who owns Promptfoo and Stream.Security?
Promptfoo is owned by OpenAI. Stream.Security is privately held.
What have Promptfoo and Stream.Security announced recently?
March 9, 2026: OpenAI agreed to buy Promptfoo, a startup helping businesses find and fix security issues in AI models during development.

About Promptfoo

Promptfoo builds open-source tools for secure, reliable AI applications. Promptfoo is based in San Francisco, California, and is now part of OpenAI. Investors and operators backed Promptfoo early, and Promptfoo builds open-source, application-focused AI security.

Promptfoo's red teaming simulates real users to uncover application-specific vulnerabilities. Promptfoo creates thousands of context-aware attacks tailored to the customer's application. Promptfoo says its tests understand business logic, RAG, agents and integrations, and cover 50+ vulnerability types from injection to jailbreaks.[4]

Promptfoo connects to AI apps, agents, and workflows. Promptfoo provides remediation guidance directly in pull requests and developer workflows. Promptfoo lets teams track remediation progress and get suggested steps for each issue.[4][5]

The Community version includes all core features for local testing, evaluation, and vulnerability scanning. The open-source Community version includes up to 10k probes per month at no charge. Enterprise customers can purchase additional probes for larger scale testing. Enterprise pricing is customized based on a team's size and needs.[5]

Promptfoo lets customers manage LLM applications with teams-based access control and SSO, granular permission profiles, and customizable API access. Promptfoo provides real-time alerts and automated evaluations to show LLM security status across all projects. Promptfoo supports customizable plugin collections, scan configurations, and target settings that can be shared among colleagues.[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's application-level jailbreak creation can be integrated with Burp Suite's Intruder feature for security testing of LLM-powered applications. Promptfoo can import eval test cases directly from Microsoft SharePoint CSV files using certificate-based authentication with Azure AD. Promptfoo configurations can reference prompts managed in Langfuse.[6][7][8][9][10]

Promptfoo offers real estate plugins that test every AI touchpoint, from property search to lending to advertising, across all 7 federally protected classes. Promptfoo tests AVM and appraisal AI for demographic correlation in valuations. Promptfoo's real estate testing covers home search assistants, neighborhood recommendation engines, property matching tools, and school district comparison features. Promptfoo's real estate testing can run entirely within a customer's infrastructure, with no applicant or transaction data leaving the environment. Promptfoo integrates with CI/CD pipelines to catch fair housing regressions before deployment. Promptfoo generates structured reports that map directly to Fair Housing Act and ECOA requirements.[11]

Promptfoo says its contributors are from companies like OpenAI, Google, Microsoft, and Amazon.[2][4][5][6][11]

Promptfoo on the record

Sources

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

Stream.Security full record

  1. [1]stream.securityStream.Security · stream.security · undated page, accessed September 27, 2026 · Tier A
  2. [2]Streamsecurity secures 30 million in series b funding 302282527Stream.Security via PR Newswire · prnewswire.com · published October 22, 2024 · Tier A
  3. [3]5f4cdb781ecba4fee31d04a1LeadIQ · leadiq.com · undated page, accessed September 27, 2026 · Tier C
  4. [4]Stream Security | Autonomous Production DefenseStream Security · undated page, accessed November 10, 2026 · Tier A
  5. [5]Streamline Integration ProgramStream Security · undated page, accessed November 10, 2026 · Tier A
  6. [6]State of Autonomous Production Defense | Stream SecurityStream Security · undated page, accessed November 10, 2026 · Tier A
  7. [7]Go Beyond CNAPP with Real-Time Cloud SecurityStream Security · undated page, accessed November 10, 2026 · Tier A
  8. [8]CustomersStream Security · undated page, accessed November 10, 2026 · Tier A

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