Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Booktok: Watch Books Explained
What if you could watch the world's greatest books like they are TV shows or movies?
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
33,107 ratings · Top 15%
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Booktok: Watch Books Explained: map the core Books workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Curate diverse genres and themes for broader appeal.
Assumption to check: Limited content variety may lead to user boredom
Validate with people who use this workflow before building.
Hypothesis 2
Implement advanced filtering and sorting options for better results.
Assumption to check: Search functionality can be slow and inaccurate
Validate with people who use this workflow before building.
Hypothesis 3
Add user-generated content and community features to enhance engagement.
Assumption to check: Videos may not be engaging enough
Validate with people who use this workflow before building.
Hypothesis 4
Provide clear benefits and exclusive content for premium users.
Assumption to check: Subscription value may not be clear
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
What if you could watch the world's greatest books like they are TV shows or movies? It's not just a book summary app -- it's a new way to learn with video. Go through hundreds of books and 1000s of lessons. We've taken the complexity out of reading. No more struggling through dense chapters. No more abandoning books halfway. Monthly: $19.99 Yearly: $69.99 Quarterly: $49.99 With either payment options you get access to our entire video book summary collection. For any help, contact us at [email protected] Here is our Terms of Service and Privacy Policy: https://www.notion.so/zerobillion/Pocketful-Terms-of-Service-611785cc1ca440d6bf36c5e9ec25d6be https://zerobillion.notion.site/Pocketful-Privacy-Policy-387a4bfba8c741c88665b684b3754201?pvs=74 For access to our entire video collection.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
axios
react-navigation
expo-video
BUILD KIT DIFFICULTY
Advanced
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
