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
- SectorsTechnology
- Website category Computers Electronics and Technology · Programming and Developer Software
- Email••••••••
- Website promptfoo.dev
- Social LinkedIn X
- Acquired by OpenAI (Mar 2026)
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.
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.
- Total Funding $23.58M
- Total Rounds 2
- Last Round Series A — $18.4M
- First Round $5.18M
(Jun 2024)
- Investors Count 5
All 2 funding rounds of Promptfoo with amounts and investors; the two latest post-money valuations are shown, the rest are part of the premium plan.
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
|---|---|---|---|---|---|
| Jul 2025 | $18.4M | Series A | – | Insight Partners | |
| Jun 2024 | $5.18M | Seed | – | a16z |
6 investors in total: 3 institutional and 3 angel.
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.
| Investor | Description | Founded Year | Domain | Location |
|---|---|---|---|---|
Venture capital investments in technology sectors are handled by Andreessen Horowitz. | – | a16z.com | - | |
Investment firm scaling software and technology companies from early to late stages. | – | insightpartners.com | - | |
OpenAI is engaged in developing advanced artificial intelligence technologies. | 2015 | openai.com | San Francisco, United States | |
TL Tobi Lutke | - | – | unknown_e382c53b744b4fa28 | - |
SV Stanislav Vishnevskiy | Co-founder of Discord, active angel investor in tech startups | – | unknown_b2a1979e93ef4aef8 | - |
FK Frederic Kerrest | Co-founder of Okta, active angel investor in tech startups globally. | – | unknown_baa2dca2fcbe47d1b | - |
Investor details for Promptfoo
The complete investor list, round-by-round participation and investor portfolios require an active premium plan.
- Complete investor list
- Round participation
- Investor portfolios
- Co-investor network
Verified entity values are shown only after access is granted.
People of Promptfoo
8 people are tracked at Promptfoo (4 in leadership, 4 in team).
| Name | Role | Group |
|---|---|---|
Ian W | Co-Founder & CEO | Leadership |
Michael D'Angelo | Co-Founder | Leadership |
Justin Beckwith | VP Of Engineering | Leadership |
Ian Webster | CEO | Leadership |
Guangshuo Zang | Staff Software Engineer | Team |
Steve Klein | Founding Engineer | Team |
Tabs M. Fakier | Founding Developer Advocate | Team |
Vanessa Sauter | Principal Solutions Architect | Team |
Complete people profiles for Promptfoo
Full employee and board profiles, team structure, tenure and professional contact details require an active premium plan.
- Full employee list
- Team structure
- Board tenure
- Professional contacts
Verified entity values are shown only after access is granted.
Timeline of Promptfoo
4 dated milestones of Promptfoo across 3 years, from founding to its latest funding, stage changes and deals.
- Founded Promptfoo is founded.
- Funding First funding round of $5.2M.
- Funding Latest funding round, Series A, of $18.4M.
- Exit Acquired by OpenAI.
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.
| Company Name | Domain | Founded | HQ Location | Total funding | Employees | Description |
|---|---|---|---|---|---|---|
| cobalt.io | 2013 | San Francisco, United States | $37.55M | – | Application security testing is delivered via a cloud-based platform. | |
| pentera.io | 2015 | Burlington, United States | $249.25M | – | Cloud-based penetration testing solutions are provided for cybersecurity validation. | |
| kolena.com | 2021 | San Francisco, United States | $18.13M | 15 | ML model testing platform for NLP, LLMs, computer vision, and structured data | |
| distributional.com | 2023 | Portland, United States | $30M | – | AI technologies are tested and evaluated via a dedicated platform. | |
| openlayer.com | 2021 | San Francisco, United States | $19.43M | – | AI evaluation and observability platform is provided for enterprise applications. | |
| getastra.com | 2018 | Delhi, India | $2.82M | 59 | Cloud-based penetration testing software is provided for vulnerability assessments. | |
| turintech.ai | 2017 | London, United Kingdom | $16.28M | 10 | Provider of AI development services |
Detailed competitors of Promptfoo
The full competitor set, operating metrics and side-by-side benchmarks require an active premium plan.
- Full competitor set
- Operating metrics
- Benchmarks
- Competitive positioning
Verified entity values are shown only after access is granted.
Web traffic of Promptfoo
The website of Promptfoo (promptfoo.dev) receives about 152K visits a month and ranks #319,722 among all websites worldwide, #7,529 in Programming and Developer Software.
- Monthly visits152K
▲ 14.6% vs previous month
- Unique visitors54.6K
per month
- Global rank#319,722
among all websites
- Category rank#7,529
Computers Electronics and Technology · Programming and Developer Software
- Bounce rate43%
- Pages per visit1.9
- Average visit48 sec
- DevicesDesktop 47% · Mobile 53%
Websites whose visitors overlap most with Promptfoo. Affinity shows how closely the audiences match.
| Website | Domain | Audience affinity | Monthly visits | Global rank | Profile |
|---|---|---|---|---|---|
| github.com | 100% | 542.6M | #65 | View details | |
ankursnewsletter.com | ankursnewsletter.com | 99% | – | #3,207,801 | – |
| confident-ai.com | 90% | 120.2K | #365,728 | View details | |
| wasp.sh | 89% | 78.5K | #461,004 | View details | |
ubiai.tools | ubiai.tools | 88% | – | #1,465,394 | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
All 40 similar websites and full traffic analytics for Promptfoo
The complete similar-websites list, audience overlap and engagement analytics require an active premium plan.
- 40 similar websites
- Audience overlap
- Engagement analytics
- Traffic by brand
Verified entity values are shown only after access is granted.
Latest news on Promptfoo
Complete news archive for Promptfoo
Full article history, source details, and older brand coverage require an active premium plan.
- Full article archive
- Source and publication date
- Older coverage
- Brand-specific news history
Verified entity values are shown only after access is granted.
Similar companies to Promptfoo
10 companies that operate in the same segment as Promptfoo (AI Core Platforms & Infrastructure), ranked by their profile score on The Company Check.
| Company | Description | Founded | Location | Total funding | Revenue | Employees |
|---|---|---|---|---|---|---|
OpenAI is engaged in developing advanced artificial intelligence technologies. | 2015 | San Francisco, California, United States | USD 167.95 B | – | – | |
AI models and chatbots are offered for industry applications. | 2021 | San Francisco, California, United States | USD 66.81 B | – | – | |
Analytics and digital solutions for healthcare and banking are provided. | 1999 | New York, New York, United States | USD 10 M | USD 2.09 B | 59,500 | |
AI-powered graphical processing units and SoCs | 1993 | Santa Clara, California, United States | USD 5 M | USD 130.5 B | 36,000 | |
A platform for the AI community to collaborate and build. | 2016 | Paris, France | USD 399.91 M | – | – | |
Digital marketing, data analytics, and IT services are provided globally. | 1981 | Bengaluru, Karnataka, India | – | USD 19.08 B | 323,580 | |
Machine learning model development and management solutions are provided. | 2017 | San Francisco, California, United States | USD 250 M | – | 150 | |
Provider of website, web & mobile application development, BI, and digital marketing services | 2007 | Jaipur, Rajasthan, India | USD 570.12 M | USD 102.68 M | 461 | |
AI-based robotic arms are developed for industrial automation tasks. | 2010 | San Francisco, California, United States | USD 123.02 M | – | – | |
Enterprise observability solutions are delivered via cloud and AI platforms. | 2008 | San Francisco, California, United States | USD 196.44 M | – | – |
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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. The company's 1st funding round was a Seed of $5.18M, raised on Jun 2024.
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.
Yes. Promptfoo was acquired by OpenAI in March 2026.
The website of Promptfoo receives about 152 thousand visits a month and ranks #319,722 among all websites worldwide.