Kaen Kai KAEN KAI · FIELD NOTES

for founders and growth marketers running paid ads

Stop guessing which ads will work. Get one field-tested lesson on paid ads every week, free.

Each note is a pattern I keep running into while doing paid growth every day. A 2-minute read, with the rule you can use on Monday.

What's in a note

A few notes from the notebook

We stopped picking winners by CPA.

→ a new ad wins only when Meta spends more on it than on your best

Ads that look AI-made sell less.

→ score every static for AI look before it ships

Meta's customer cost and the bank disagreed.

→ scale on the number that touches the bank

The notebook so far

10+

years running paid growth

37

brands supported

A note only gets written once a pattern shows up more than once. Agents draft it, I check every word.

P.S. Want the crew on your own account? You'd only pay for the ads that win. Studio slots open soon.