Promptfoo
Promptfoo is an infrastructure company in San Francisco, United States, founded in 2023. It has raised $23.4M across 2 rounds, most recently an $18.4M Series A in July 2025.
Build secure AI applications
- Headquarters
- San Francisco, California
- Employees
- 11–50
- Founded
- 2023
- Business Model
- B2B
- Website
- promptfoo.dev
- Total Funding
- $23.4M
- Last Round
- $18.4M Series AJul 2025
- Rounds
- 2
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
Indexed holds 2 funding rounds and 3 investors for this company. The full record is or through the API.
About
Promptfoo is an AI security platform that helps enterprises find and fix vulnerabilities in LLM applications, AI agents, and RAG systems before they reach production. The platform performs automated red teaming — simulating real attackers to uncover application-specific vulnerabilities including prompt injections, jailbreaks, data and PII leaks, business rule violations, insecure tool use in agents, and toxic content generation. Promptfoo integrates directly into CI/CD pipelines and developer workflows, providing security findings in pull requests and actionable remediation steps. Originally launched as an open-source LLM evaluation tool, the platform is now trusted by 127 of the Fortune 500 and a community of 300,000+ developers. The company was acquired by OpenAI in March 2026.
Summary
It lists 11–50 employees. It has raised $23.4M in total across 2 rounds, most recently a $18.4M Series A round in Jul 2025. Investors include Andreessen Horowitz, Insight Partners and Frederic Kerrest.
Tech & App Stack
5 technologies & apps tracked
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Funding History
Jul 2025
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Funding: Seed through Series A. Amounts, valuations, and investors where available.
Investors
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