About Chordio.
Chordio is a product experience lab. AI agents now ship software that people use without a designer ever seeing it, and our mission is to make what they ship measurable as a product, not just as code, so every model and every agent can get better at it. What we measure is product experience: the way a person experiences what the agent built, its form and its function together.
Our main work is PX-bench, a long-horizon product experience benchmark for coding agents. We publish the methodology as research notes, and teams building agents can run the same bench privately.
From building with agents to measuring them
Chordio did not start as a lab, but it did start in design. Co-founders Ehud Halberstam and Amit Bar spent over a decade in design and UX; our previous startup, Brand.ai, was acquired by InVision and became InVision Design System Manager. Chordio began by building on top of frontier models: Chordio UX Reviews, agent-run design reviews of shipped interfaces, and Chordio Workbench, where product teams prototyped features on a high-fidelity clone of their own product.
Building those meant pushing agents toward product-grade output every day. With the right harness (the skills, context, and review loops around the model) the same model shipped a visibly better product; past a point, no scaffolding supplied the product judgment the model lacked. The harder problem was measurement. Models improve fastest where outcomes are easy to verify, and product quality has no such signal. When we changed the harness, all we could check was that the code compiled and the demo looked right. We were tuning by anecdote.
PX-bench is the instrument we wished we had. It gives labs a way to push models on product capability, and agent builders a way to tell whether a harness change moved product quality.
Backing
Chordio is backed by Y Combinator and by angel investors including Nat Friedman (co-lead of Meta Superintelligence Labs), Guy Podjarny (founder of Snyk and Tessl), and Clark Valberg (founder of InVision).
Get in touch
To put your coding agent through a private PX-bench evaluation, or to ask about the methodology, write to hello@chordio.com.