Field notes

Notes on friction, fixes, and conversion

What we learn watching real users get stuck, and what to do about it before it costs you sign-ups.

August 20, 2026The field where signups go to dieForm abandonment is almost never about the form. It is about one field, and the form has usually been telling you which one all along.
August 13, 2026Building an agent that cannot file a lieOur nightly agent is not allowed to report a bug it cannot prove. On moving hallucination from a model problem to a systems problem, and what that trade cost us.
August 6, 2026PostHog's Replay Vision sends your users' screens to GooglePostHog's new AI feature watches your users' sessions and ships the video to Google to do it. Here's what it does well, what it doesn't, and what it actually costs.
August 6, 2026We gave our AI a card with a hard limitBefore our detection agent ever ran unsupervised, we built it an accounting system. Notes on the least interesting thing we've shipped and why it is load-bearing.
August 2, 2026How to tell when a deploy breaks your UXA before-and-after method for catching UX regressions within hours of a release instead of weeks later, and for proving your fixes actually landed.
July 30, 2026Your error tracker thinks your site is fineEvery bug we caught on our own sites last month shipped without throwing a single exception. Notes on the failures that live outside the console.
July 26, 2026How to find UX issues without session replayA signal-based method for discovering what frustrates users, without recording screens, watching videos, or storing anything personal.
July 23, 2026Teaching an agent to skimOur nightly agent reads every session from the day before deciding what to investigate. It can only afford that because of the least glamorous part of the system.
July 19, 2026How to reduce form abandonmentA practical method for finding the exact field where your form loses people and fixing it, with the field-level measurements that make each fix verifiable.
July 16, 2026Our nightly AI agent kept dying at turn 12The agent that investigates our sites every night started leaving half-finished runs behind, always at the same turn. What I found when I went digging.
July 8, 2026An AI investigates our website every nightWe pointed our own detection agent at our own sites, expecting noise. It keeps finding real bugs we shipped with confidence. Two stories and what they taught us.
June 30, 2026The confused users you never hear fromFor every person who emails support about a confusing screen, a crowd hit the same wall and left silently. The math of silent confusion, and how to see it.
June 24, 2026Your launch traffic didn't convert. Here's where it went.Launch day sends you the most curious, least patient visitors you'll ever get. Most teams learn nothing from them. A post about the leak nobody instruments.
June 12, 2026What rage clicks tell youA rage click is a user telling you something is broken, in the only language they have. Here is how to read them and what to do next.
June 9, 2026Session replay won't tell you what to fixWatching recordings feels like research. It mostly isn't. Here's the difference between seeing what happened and knowing what to change.
June 5, 2026Did your fix actually work?Most teams ship a UX fix and never check whether it helped. The verification loop is the cheapest reliability win you're not using.