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hookchain
AppsUs vs. themStudy & education apps25s · 9:16Best on Kling 4.0

600 index cards for torts vs. one app

A law student drops a brick of rubber-banded index cards on her library desk next to her phone and compares the two: cards she has to sort by hand versus an app that resurfaces the cases she keeps forgetting.

Example product
Caselock — A law-school flashcard app with case briefs and spaced repetition
Audience
Law students preparing for exams
Creator
Second-year law student, mid-20s

Variables — swap these for your product

{{APP_NAME}} = Caselock{{CARD_COUNT}} = six hundred{{OFFER}} = Free through your first exam season

01 · hook

The brick of cards

0–3s

“{{CARD_COUNT}} cards for torts. Or this.”

Subject: Woman, 24, Egyptian-American, cream hijab, warm olive skin, camel blazer over a black turtleneck, slim gold watch.
Setting: Law-school library carrel, afternoon, rubber-banded stacks of index cards, thick casebook, warm brass desk lamp, tall windows.
Vertical 9:16 handheld close-up. a 24-year-old Egyptian-American woman with long dark hair under a cream hijab, warm olive skin, a camel blazer over a black turtleneck and a slim gold watch sits at a law-school library carrel in the afternoon, rubber-banded stacks of handwritten index cards and a thick casebook, warm brass desk lamp and tall windows behind. Her hands drop a thick brick of rubber-banded index cards onto the desk with a heavy thud next to an iPhone lying face up, then she looks at the lens and taps each in turn. Warm brass-lamp light, real cardboard and paper texture, natural skin texture, shot on iPhone, unpolished.
[Creator: Second-year law student, mid-20s, natural and conversational]: "{{CARD_COUNT}} cards for torts. Or this."
duration
5 s (trim to 3 s)
aspect ratio
9:16
mode
Pro / 1080p
cfg scale
0.5
negative prompt
subtitles, captions, on-screen text, watermark, logo, distorted hands, extra fingers, warped phone screen, morphing face, plastic skin, studio lighting
elements
creator, setting
native audio
on (voice reference optional)

Shot list

  1. 0.0–1.5sCU, hands. Card brick thuds onto the desk
  2. 1.5–3.0sMCU. Taps cards, then phone, delivers line

On-screen text (overlay in edit)

600 index cards vs. 1 app

Audio

Heavy thud, library hush, no music

References

02 · demo

Sorting vs. resurfacing

3–11s

2 shots, 3 model prompts, settings and captions in the full library.

Unlock

03 · proof

The case she keeps missing

11–18s

2 shots, 3 model prompts, settings and captions in the full library.

Unlock

04 · cta

Retire the cards

18–25s

2 shots, 3 model prompts, settings and captions in the full library.

Unlock

Launch offerLaunch pricing ends Sunday

The hook is free. The rest is in the Apps & SaaS edition.

Unlock this chain + 119 more.

Demo, proof and CTA prompts in three model dialects, settings, shot lists, captions and reference-image guidance — for every chain in the edition, plus 30 sample ads.

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Why it works

The physical brick of cards makes the old way tangible and slightly absurd, which Kling renders well. The comparison is about one real mechanism (who tracks what you're bad at), not vague speed claims. The proof admits the app is annoying, which makes it believable.

Hook variants to A/B test

  • “I handwrote six hundred flashcards. Never again.”
  • “Law students: put the index cards down.”
  • “My torts cards weigh more than my laptop.”

Reference images

  • creator

    Shoulders-up photo of the creator in the cream hijab, camel blazer and black turtleneck, warm library light

  • setting

    Law-library carrel with brass lamp, casebook and stacks of index cards, tall windows

  • screen

    Your app's case card with recall buttons and a 'due today' list with a repeated case first, as 9:16 PNGs

  • endcard

    App icon, app name, offer line and store badges (or URL) on a plain background

Creator look (paste into your image model)

Woman, 24, Egyptian-American, cream hijab, warm olive skin, camel blazer over a black turtleneck, slim gold watch. Law-school library carrel, afternoon, rubber-banded stacks of index cards, thick casebook, warm brass desk lamp, tall windows.

Model notes, last verified 2026-10-16: Provisional: written to Kling 3.0 conventions (3.0-compatible) until 4.0 publishes its own. 3, 5 or 10 s only; audio always on; add captions in post.

Related chains

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