Notes on Shopify & paid ads.
Practical, no-fluff writing on Shopify, TikTok Ads, Meta Ads, creatives and testing. Useful whether or not you ever join.
Testing
How Much Should You Spend Before Judging an Ad?
Kill an ad too early and you bury winners; wait too long and you burn cash. Here's a principled way to decide, tied to your break-even CPA.
Duper
Paid Ads Metrics
How to Calculate Break-Even ROAS (and Why It Decides Everything)
Break-even ROAS is the one number that tells you whether an ad is making or losing money. Here's how to calculate it and how to use it.
Ray
Paid Ads Metrics
CPM vs CTR vs CPC vs CPA: What Each Number Is Actually Telling You
A plain-English guide to the four paid-ads metrics that matter most, how they connect, and which one to look at when something's wrong.
Duper