VVinci

Free tools / Video Hook Analyzer

Find out if your first 3 seconds will stop the scroll

Upload a Reel, Short, TikTok or ad. We read the frames, listen to the audio and tell you where people will swipe away, with fixes you can make today.

What it checks

Hook strength

How hard the opening works to keep someone watching: the first frame, the first line and any text on screen.

Retention risks

Moments where attention drops, like dead air, a slow reveal or a long static shot, each with a timestamp and a fix.

Transcript and pacing

A timestamped transcript, words per minute, when speech starts and how often the edit cuts.

Sound-off test

Whether the video still lands with the sound off, which is how most feeds autoplay.

Call to action

Whether you ask for anything, and a sharper CTA for this specific video.

Five new hooks

Rewritten openings in different styles: question, bold claim, pattern break, story and stat.

How it works

  1. Upload

    Pick an MP4 or MOV up to 3 minutes. Frames and audio are prepared in your browser, so the upload stays small.

  2. We review it

    A speech model transcribes it, a calibrated judge scores fixed questions, and a vision model writes the notes.

  3. Fix and re-test

    Work through the fixes in order of impact, then run the new cut to compare scores.

Questions

What is a video hook?

The hook is what happens in the first one to three seconds: the first frame, the first line and any text on screen. On Reels, Shorts and TikTok it decides whether someone keeps watching or swipes.

How is the hook score calculated?

A calibrated judge model answers fixed questions about your video (does the first frame stop the scroll, is the topic clear in three seconds, is there text on screen) and returns probabilities. We combine those with measured signals such as when speech starts. The same video gets the same score.

Is it really free?

Yes. You get the scores, the summary and the top fix without signing up. Add your email to unlock the full timeline, every retention risk, the transcript and five rewritten hooks. Sign in with Vinci to check videos against your brand guidelines.

What happens to my video?

Your browser extracts still frames and the audio track. Only those are sent for analysis; the full file is sent only for clips under 60 seconds and 12 MB. We do not use your uploads to train models and we delete media after processing.

Which formats work?

MP4 and MOV with H.264 or HEVC video in a recent Chrome, Safari, Edge or Firefox. Vertical 9:16 is ideal for Reels, Shorts and TikTok, but any ratio works.

Can Vinci fix the video for me?

Yes. Vinci is an AI-native creative studio. We can re-cut, re-hook, localise or reshoot short-form video at volume. Book a call from the report.

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Need the content made, not just reviewed?

Vinci produces films, social cut-downs, product imagery and localised versions for brands and agencies.

Talk to the studio