AIAI Governance StackFree kit

Promptfoo vs Vijil

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 Vijilleads with “Trust infrastructure to make enterprise AI agents secure, reliable, and resilient”. 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 Vijil pulls ahead

Teams building enterprise AI agents that need lifecycle testing, hardening, and trust evidence

Promptfoo
Vijil
PositioningOpen-source tool for evaluating and red-teaming LLM apps, agents, and RAG systemsTrust infrastructure to make enterprise AI agents secure, reliable, and resilient
CategoryRed-Teaming & AI SecurityRed-Teaming & AI Security
FrameworksNone publishedNone published
DeploymentOpen-source, SaaS, APISaaS, API
Built forData Science / ML, SecuritySecurity, Data Science / ML, Risk
Founded20232023
HeadquartersUSACalifornia, USA
OwnershipAcquired by OpenAI (2026); previously VC-backedPrivate (VC-backed)
Funding~$23.4M raised prior to acquisition; $5M seed (a16z, 2024) and $18.4M Series A led by Insight Partners (2025)$23M total; $17M round in November 2025 led by Brightmind Partners with Mayfield and Gradient Ventures, following a $6M seed in 2024
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
  • Agent security and reliability testing
  • Pre-deployment evaluation
  • Runtime protection
  • Trust scoring
  • Continuous monitoring
  • Risk remediation
IntegrationsOpenAI, Anthropic, Google Gemini, DeepSeek, CI/CD pipelines, GitHubNot published
Notable customersOpenAI, Anthropic, Fortune 500 enterprisesSmartRecruiters
Best forDeveloper teams wanting free, open-source, CI/CD-integrated evaluation and red teaming of LLM appsTeams building enterprise AI agents that need lifecycle testing, hardening, and trust evidence
LimitationsDeveloper-oriented and requires engineering effort to configure; broader governance/compliance features live in the paid enterprise tier.Early-stage vendor; detailed framework mappings and integration list are not extensively documented publicly.

Which should you shortlist?

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

Choose Vijil if teams building enterprise AI agents that need lifecycle testing, hardening, and trust evidence

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 Vijil profile →

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