# OnPuck

> OnPuck checks user stories against your data, writes specs for your coding agent and tests them on simulated users. For growing startups in San Francisco, CA, USA.

OnPuck turns user stories into specs checked against code, analytics and logs. The founders applied this workflow in Woku and shipped changes. We are building a repeatable platform for coding agents, alongside a separate research prototype that tests preview builds with simulated users. The founders applied the evidence workflow in Woku; the simulator is a separate research prototype under evaluation, with its misses published. Contact: paula@onpuck.com.

## Light paper

- [Light paper as Markdown](https://www.onpuck.com/index.md): the full page as text, with figures, experiments and references
- [Light paper](https://www.onpuck.com/): the same content as HTML
- [How OnPuck works](https://www.onpuck.com/#how-it-works): plug in your stack, we talk to your users, your agent ships the right fix; works with GitHub, PostHog, Sentry, Axiom, CloudWatch, Postgres, MongoDB, Claude Code, Codex, Cursor, Copilot, OpenCode
- [How OnPuck turns user stories into specs for your coding agent](https://www.onpuck.com/#model): connect, listen, anchor, spec, simulate, ship, calibrate
- [From customer interviews to shipped changes in Woku](https://www.onpuck.com/#field-work): human-led interviews, 79 trackers, evidence-backed specs and recorded production rollouts; no claim of causal uplift or simulator accuracy
- [How accurate are simulated users? Our validation](https://www.onpuck.com/#evidence): four experiments on woku, misses included, one blind prediction pending
- [What simulated users cannot predict](https://www.onpuck.com/#limits): what OnPuck cannot promise, and the mitigation for each

## Design partner program

- [Program](https://www.onpuck.com/#program): length: 3 months, renewable; check-in: Every two weeks; cost: Free; cohort: 5 teams in San Francisco
- [Apply](https://www.onpuck.com/#apply): work email, company URL, role, a recent change that did not do what you expected, stack. A person must submit it
- [Book a 30-minute call](https://cal.com/paulariquelme/30min): with the founders, no application needed
- [Questions](https://www.onpuck.com/#faq): access and data, time, cost, who runs it

## About

- [Paula Riquelme](https://www.linkedin.com/in/pauriquelme/): co-founder, engineer, researches and builds the models behind OnPuck
- [Diego Orrego](https://www.linkedin.com/in/diorrego): co-founder, engineer, researches and builds the models behind OnPuck
- [woku](https://woku.app/en): the founders' product in production, OnPuck's lab

## Optional

- [References](https://www.onpuck.com/#references): 36 papers behind every claim
- [Sitemap](https://www.onpuck.com/sitemap.xml)