Predict whether viewers stay past 30 seconds
Most "hook scoring" advice is vibes. This combines seven weighted factors that you actually control on a shoot day (visual motion, face on screen, text-on-screen, sound design, hook-promise match, opening cut tempo, B-roll density) into one 0–100 score with a tier and an action list.
How to read this & limits
How to read: 70+ means your hook is structurally tight. 50–69 is fine but improvable — usually one of the cheap fixes in the action list moves you up a tier. Under 50, you're competing on thumbnail CTR alone, which is an uphill battle.
Limits: This is a heuristic for YouTube-style vertical-feed retention. TikTok and Shorts favor stronger visual motion in the first 0.5s — bump the motion slider up by 2 if that's your target. The score does not know your niche, your thumbnail, or your audience size — none of which can be solved inside a calculator.