What is Ad Hook?

An ad hook is the opening moment of an ad — the first line, visual, or action in roughly the first three seconds — whose only job is to stop the scroll and earn the next few seconds of attention.

Why it matters

On feed platforms most viewers decide to skip or stay almost immediately, so the hook has outsized influence on every downstream metric: watch time, clicks, and ultimately cost per purchase. Hooks work through curiosity, pattern interrupts, bold claims, direct callouts ("if you have oily skin, stop scrolling"), or immediately showing a striking result. Because the rest of the ad can stay identical, hooks are the cheapest high-leverage variable to test.

Reading the signals

• Good: hook variations producing clearly different hold rates and thumb-stop behavior on the same body content
• Bad: ads that open with a logo, slow intro, or context-setting before anything interesting happens
• Good: winning hooks recycled onto new angles and formats to extend their life

What to do about it

Hook testing rewards volume: same ad body, many openings, and the data picks the winner. Generating a batch of hook variants in one request inside Claude with Polaris — paste the script, swap the first line per variant — makes running double-digit hook tests routine instead of a production ordeal. See the full ecommerce ads glossary, or put it into practice with the Polaris AI UGC ad generator.