About Promptfoo
Promptfoo is a company based in San Francisco (United States) founded in 2023 by Ian W and Michael D'Angelo was acquired by OpenAI in March 2026. Promptfoo has raised $23.58 million across 2 funding rounds from investors including OpenAI, Andreessen Horowitz and Tobi Lutke. Promptfoo offers products and services including Red Teaming, Guardrails, and Model Security Evaluations. Promptfoo operates in a competitive market with competitors including Cobalt, Pentera, Kolena, Distributional and Openlayer, among others.
- Headquarter San Francisco, United States
- Founders Ian W, Michael D'Angelo
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Technology
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Products & Services of Promptfoo
Promptfoo offers a comprehensive portfolio of products and services, including Red Teaming, Guardrails, and Model Security Evaluations.
Generates customized attacks to identify AI vulnerabilities.
Implements safeguards against prompt injections and data leaks.
Evaluates AI models for risks like toxic content generation.
People of Promptfoo
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Software Development Team
3 people
Founding Team
2 people
Co Team
1 people
Leadership Team
1 people
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Funding Insights of Promptfoo
Promptfoo has successfully raised a total of $23.58M across 2 strategic funding rounds. The most recent funding activity was a Series A round of $18.4 million completed in July 2025. This substantial capital infusion reflects strong investor confidence in the company's business model, growth potential, and market opportunities. The funding enables strategic expansion, product development, market penetration, and operational scaling to drive long-term value creation and competitive advantage.
Investors in Promptfoo
Promptfoo has secured backing from 6 investors, including venture fund, angel, and institutional investors. Prominent investors backing the company include OpenAI, Andreessen Horowitz and Tobi Lutke.
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Venture capital investments in technology sectors are handled by Andreessen Horowitz.
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OpenAI is engaged in developing advanced artificial intelligence technologies.
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Investor details for Promptfoo
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Investments & Acquisitions by Promptfoo
Investment portfolio details for Promptfoo
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Financial Statements - Promptfoo
Detailed financials for Promptfoo
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Promptfoo Comparisons
Peer comparison for Promptfoo
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Competitors of Promptfoo
Promptfoo operates in a dynamic and competitive business environment, facing competition from various established players and emerging companies in the market. The competitive landscape includes prominent companies such as Cobalt, Pentera, Kolena, Distributional and Openlayer, among others.
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Application security testing is delivered via a cloud-based platform.
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Cloud-based penetration testing solutions are provided for cybersecurity validation.
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ML model testing platform for NLP, LLMs, computer vision, and structured data
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AI technologies are tested and evaluated via a dedicated platform.
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AI evaluation and observability platform is provided for enterprise applications.
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Cloud-based penetration testing software is provided for vulnerability assessments.
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Detailed competitors of Promptfoo
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Latest news on Promptfoo
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Frequently Asked Questions about Promptfoo
Promptfoo was founded in 2023 and raised its 1st funding round 1 year after it was founded.
Promptfoo is headquartered in San Francisco, United States. It is registered at San Francisco, California, United States.
Ian W is the current CEO of Promptfoo. They have also founded this company.
Promptfoo is a funded company, having raised a total of $23.58M across 2 funding rounds to date.
Promptfoo was founded in 2023 in San Francisco, United States, as an open-source platform in the AI software sector. LLM applications are tested and debugged through customized scans that identify vulnerabilities, including PII leaks, insecure tool use, jailbreaks, harmful content, competitor endorsements, political statements, and medical or legal advice. Performance optimization is supported for developers operating in this field.
Promptfoo's top competitors include Cobalt, Pentera and Distributional.
Promptfoo offers Red Teaming, Guardrails, and Model Security Evaluations.
Promptfoo has 6 investors. Key investors include OpenAI, Andreessen Horowitz, Tobi Lutke, Stanislav Vishnevskiy, and Frederic Kerrest.