AIAI Governance StackFree kit

Promptfoo vs SplxAI

Both compete in Red-Teaming & AI Security. Promptfoo positions itself as “Open-source tool for evaluating and red-teaming LLM apps, agents, and RAG systems”, while SplxAIleads with “End-to-end security for AI with automated red teaming and runtime protection for agentic systems”. The table below compares what each publishes.

Where Promptfoo pulls ahead

Developer teams wanting free, open-source, CI/CD-integrated evaluation and red teaming of LLM apps

Where SplxAI pulls ahead

Enterprises wanting full-stack AI security from red teaming through runtime protection for agentic systems

Promptfoo
SplxAI
PositioningOpen-source tool for evaluating and red-teaming LLM apps, agents, and RAG systemsEnd-to-end security for AI with automated red teaming and runtime protection for agentic systems
CategoryRed-Teaming & AI SecurityRed-Teaming & AI Security
FrameworksNone publishedNone published
DeploymentOpen-source, SaaS, APISaaS, API, Open-source
Built forData Science / ML, SecuritySecurity, Data Science / ML, GRC
Founded20232023
HeadquartersUSADover, Delaware, USA
OwnershipAcquired by OpenAI (2026); previously VC-backedAcquired by Zscaler (2025)
Funding~$23.4M raised prior to acquisition; $5M seed (a16z, 2024) and $18.4M Series A led by Insight Partners (2025)~$9M total; $7M seed in March 2025 led by LauncHub Ventures
PricingOpen-source (MIT license), free; paid enterprise platformNot published
Key capabilities
  • LLM evaluation and benchmarking
  • Automated red teaming and vulnerability scanning
  • Declarative test configs
  • Prompt and model comparison
  • CI/CD integration
  • Local/self-hosted execution
  • Automated red teaming
  • AI asset management and discovery
  • Runtime input/output guardrails
  • Dynamic prompt hardening
  • Governance and compliance mapping
  • Agentic Radar open-source scanner
IntegrationsOpenAI, Anthropic, Google Gemini, DeepSeek, CI/CD pipelines, GitHubMCP servers, GitHub
Notable customersOpenAI, Anthropic, Fortune 500 enterprisesNone published
Best forDeveloper teams wanting free, open-source, CI/CD-integrated evaluation and red teaming of LLM appsEnterprises wanting full-stack AI security from red teaming through runtime protection for agentic systems
LimitationsDeveloper-oriented and requires engineering effort to configure; broader governance/compliance features live in the paid enterprise tier.Now part of Zscaler, so standalone availability and roadmap are tied to the acquirer; detailed compliance certifications not publicly enumerated.

Which should you shortlist?

Choose Promptfoo if developer teams wanting free, open-source, CI/CD-integrated evaluation and red teaming of LLM apps

Choose SplxAI if enterprises wanting full-stack AI security from red teaming through runtime protection for agentic systems

Neither is a substitute for a governance program. Whichever you pick, you still need people who can define the policies the tool enforces.

Full Promptfoo profile →Full SplxAI profile →

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