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Ian Webster
@iwebst
building @Promptfoo (LLM security) + "curator of the world's largest digital dinosaur database"
CA
promptfoo.dev
Joined December 2012
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  • user avatar
    Ian Webster
    @iwebst
    Mar 9
    Promptfoo will be joining OpenAI. We’re staying open source and we’re going to keep supporting customers and users. We built Promptfoo to help devs test and secure AI apps. The results have been phenomenal: 350k+ developers, 25%+ of the Fortune 500, 23 people, ~2 years. AI
  • user avatar
    Ian Webster
    @iwebst
    Feb 24
    The OpenAI vs Anthropic enterprise narrative is skewed by sketchy data and VCs with agendas. Here's what we've seen in ~100 recent enterprise convos with actual builders. 71% of sampled cos have >$1B in revenue, 54% are public with over 10k employees
  • user avatar
    Ian Webster
    @iwebst
    Jul 29, 2025
    We’ve raised an $18.4M Series A led by @insightpartners, with participation from @a16z, to build the best security stack for AI applications. Promptfoo started a year ago as an open source project and is now the most widely adopted toolkit for reducing security, compliance, and
  • user avatar
    Ian Webster
    @iwebst
    Sep 17, 2024
    Anthropic has been quietly publishing top notch content on LLM fundamentals. Lots of great examples of using Promptfoo for evals in this new course!
    user avatar
    Alex Albert
    @alexalbert__
    Sep 16, 2024
    Our latest course on LLM prompt evaluations is out. Evals ensure your prompts are production-ready as you're able to quickly catch edge cases and zero in on exactly where your prompts need work. Let's walk through what the course covers: