YouTube hook analyzer

A YouTube hook analyzer reads the opening of your video the way a first-time viewer experiences it: what is promised, how long until the first thing worth staying for, and whether anything is left open. Retti's Hook Review does that for a script or a video link, then gives you stronger openings to test. Once the video is live, your retention graph shows how many viewers the opening really kept.

Updated October 2026 · By the Retti team

What a hook analyzer should check

The hook is the only part of a video every viewer sees, and the part you can least judge yourself, because you already know what happens next. A useful analysis looks at four things:

• The promise. Does the opening confirm what the title and thumbnail set up, or does it open with something else?
• Time to first value. How long a viewer waits before the first moment they would miss if it were cut. This is usually the most expensive number in the opening.
• Open loops. Which questions the hook leaves unanswered, and whether the video closes them. A hook that answers itself leaves nothing to hold anyone with.
• Delivery. How the opening lands as spoken performance, and whether it matches the click it earned.

How Retti's Hook Review works

Paste a hook, a script or a video link into Hook Review. You get a read of the opening with the reasoning behind it, the first 30 seconds split into beats with a verdict on each, and several distinct alternative angles rather than one polished version of the same idea. The right hook for a documentary is not the right hook for a challenge video, so the alternatives differ in approach, not just wording.

How to measure a hook after you publish

The real test is the retention graph. Hover at 0:30 in YouTube Studio and read how much of the audience is still there. Rules of thumb you will see quoted put a strong opening at 80% or more of viewers still watching at that point. Compare against your own recent videos of similar length; if 0:30 is where you lose the most, the opening is the first thing to fix. Every curve falls steeply at the start, so judge where the early drop levels off, not just its size. Our guide on what a good retention rate looks like has the rough benchmarks.

Learn more about hooks

• How to analyse a hook before you publish
• How to fix a weak YouTube hook
• The first 30 seconds of a YouTube video
• The first sentence that decides whether viewers stay
• How long should a YouTube intro be?

Who it is for

Retti is built for long-form creators (videos of 8 minutes and up). If you write your script first, Script Review checks the whole structure around the hook. If the video is already cut, Edit Review puts timestamped notes on the opening frames. If it is published, Video Review shows what the opening did to the curve.

Frequently asked questions