CISO Tribune

Vendor comparison · 2 companies

Promptfoo vs SplxAI

Promptfoo builds open-source tools for secure, reliable AI applications. SplxAI, which uses the name SPLX, sells scalable red teaming, real-time threat protection, and automated AI compliance and governance for AI systems. CISO Tribune files both under AI model and agent security, AI firewalls and guardrails and Static application security 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.

Change the companies

Up to four companies side by side.

  • Promptfoo
  • SplxAI
Promptfoo vs SplxAI: Products, Customers and Funding Compared
PromptfooPromptfoo builds open-source tools for secure, reliable AI applications.promptfoo.devSplxAISplxAI, which uses the name SPLX, sells scalable red teaming, real-time threat protection, and automated AI compliance and governance for AI systems.splx.ai
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.
  • Agentic Radar[1][5]An open-source security scanner for agentic AI.
Categories
Headquarters
San Francisco, United States[1][3]Not stated on its pages
Founded
2024[1][12]2023[2]
Ownership and funding
Owned by OpenAI[12]Owned by Zscaler since 2025[3]
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 yetFrom its own pages, the company sells mainly to enterprises, saying the platform is built for enterprise scalability. Its asset management messaging speaks to organisations that want visibility and control over the AI assets used in the organisation. Its runtime messaging addresses teams with AI systems in production. Its governance messaging speaks to teams working with global AI security frameworks and internal risk policies.
Last verified
November 4, 2026September 30, 2026

Where they overlap

  • AI model and agent security is the primary category of both Promptfoo and SplxAI; both are also filed under AI firewalls and guardrails and Static application security testing.

Where they differ, field by field

  • Promptfoo is also filed under Breach simulation and automated pen-testing. SplxAI is also filed under AI governance.
  • Promptfoo lists Red Teaming and Evaluations. SplxAI lists Agentic Radar.
  • Promptfoo is headquartered in San Francisco, United States.
  • Promptfoo was founded in 2024. SplxAI was founded in 2023.
  • Promptfoo is owned by OpenAI. SplxAI is owned by Zscaler, since 2025.

How they differ

CISO Tribune files both Promptfoo and SplxAI under AI model and agent security as the primary category, and both also appear under AI firewalls and guardrails and Static application security testing. Promptfoo sells Red Teaming, which creates thousands of context-aware attacks tailored to the customer's application, and Evaluations, which run LLM evaluation of prompts and models inside CI workflows. Its open-source Community version includes up to 10k probes per month at no charge. SplxAI, which uses the name SPLX, sells red teaming, real-time threat protection, and automated AI compliance and governance. It also sells Agentic Radar, an open-source security scanner for agentic AI.

The two overlap on red teaming and CI integration, since SplxAI says its platform integrates into the CI/CD pipeline. SplxAI also lists runtime guardrails that block prompt injections and sensitive data leakage, and a detected inventory of LLMs that users can approve or block. CISO Tribune also files SplxAI under AI governance, which Promptfoo's filing does not include, while Promptfoo is also filed under Breach simulation and automated pen-testing.

Promptfoo is headquartered in San Francisco, United States, was founded in 2024, and is owned by OpenAI. On March 9, 2026, OpenAI announced it had acquired Promptfoo. SplxAI was founded in 2023 and has been owned by Zscaler since 2025. SPLX describes itself as a remote-first team that helps global enterprises secure AI systems end-to-end.

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 Promptfoo and SplxAI

What do Promptfoo and SplxAI sell?
Promptfoo sells Red Teaming and Evaluations. SplxAI sells Agentic Radar.
Are Promptfoo and SplxAI in the same category?
Yes. AI model and agent security is the primary category of both on CISO Tribune.
Where are Promptfoo and SplxAI headquartered?
Promptfoo is headquartered in San Francisco, United States.
When were Promptfoo and SplxAI founded?
Promptfoo was founded in 2024. SplxAI was founded in 2023.
Who owns Promptfoo and SplxAI?
Promptfoo is owned by OpenAI. SplxAI is owned by Zscaler, since 2025.
Who are Promptfoo and SplxAI sold to?
From its own pages, the company sells mainly to enterprises, saying the platform is built for enterprise scalability.
What have Promptfoo and SplxAI 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

SplxAI full record

  1. [1]splx.aiSplxAI · splx.ai · undated page, accessed September 30, 2026 · Tier A
  2. [2]SplxAI Closes $7M Seed Funding Round to Help Organizations Secure Agentic AI SystemsBusiness Wire · businesswire.com · published March 26, 2025 · Tier A
  3. [3]Zscaler acquires splxSplxAI · splx.ai · published November 3, 2025 · Tier A
  4. [4]SPLX Platform | End-to-End Security for the AI LifecycleSPLX · undated page, accessed October 31, 2026 · Tier A
  5. [5]SPLX | End-to-End Security for AISPLX · undated page, accessed October 31, 2026 · Tier A
  6. [6]AI Governance & Compliance | Stay Aligned with AI PoliciesSPLX · undated page, accessed October 31, 2026 · Tier A
  7. [7]Remediation | Harden your LLM system prompts to mitigate risksSPLX · undated page, accessed October 31, 2026 · Tier A
  8. [8]AI Asset Management | Unified Inventory & Security for Enterprise AISPLX · undated page, accessed October 31, 2026 · Tier A
  9. [9]Probe | Automated & Continuous Red Teaming for Conversational AISPLX · undated page, accessed October 31, 2026 · Tier A
  10. [10]AI Runtime Protection | Real-Time AI Threat DetectionSPLX · undated page, accessed October 31, 2026 · Tier A
  11. [11]SplxAI | The future of automated AI Red TeamingSPLX · undated page, accessed November 10, 2026 · Tier A
  12. [12]Monitoring | Analyze LLM Logs to proactively identify malicious user activitySPLX · undated page, accessed November 10, 2026 · Tier A
  13. [13]LLM Benchmarks | Compare and Evaluate the Security of Leading AI ModelsSPLX · undated page, accessed November 10, 2026 · Tier A
  14. [14]Security and TrustSPLX · undated page, accessed November 10, 2026 · Tier A
  15. [15]Pricing & PlansSPLX · undated page, accessed November 10, 2026 · Tier A

Spot a factual error? Request a correction.