About Us
Making LLM evaluation accessible to every product manager
Our mission
We’re turning LLM evaluation into a product superpower. AI isn’t just about building, it’s about knowing it works. As Kevin Weil, CPO at OpenAI, put it:
“Writing evals is going to be one of the core skills for PMs.”
Kevin Weil - CPO at OpenAI
And as Mike Krieger, CPO at Anthropic, adds:
“If there’s one thing we can teach people, it’s that writing evals is probably the most important thing.”
Mike Krieger - CPO at Anthropic
Plumloom makes that skill intuitive, fast, and business-relevant. No PhD required.
Why we built Plumloom
Most AI teams still fly blind. They ship AI experiences without hard evidence that they deliver real customer or business value.
Plumloom exists to change that.
No more guesswork. Run evaluations across models and use cases with just a few clicks.
No more vague metrics. Get signal on what matters to your product—outcomes, quality, and consistency.
No more blind launches. Compare options, control costs, and build the confidence to launch AI that works.
We built Plumloom to answer the one question that matters: “Does this actually work for our users, our brand, and our bottom line?”
Now, every PM can answer that—confidently, before launch.
What powers that confidence?
And yes, it’s rigorous. Under the hood, Plumloom tracks over 60 distinct evaluation signals—spanning quality, safety, cost, and consistency—so you don’t have to. It’s built to surface what actually matters, not just what looks good in a demo.
No config dumps. No spreadsheet gymnastics. Just sharp, defensible answers—ready when leadership asks, “Why this model? Why now?”
That’s how PMs go from “let’s hope this works” to “we know it does.”
Founded in Silicon Valley