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
Reading List: Book Tracker
Easily track books you’ve read, books you’re reading, and books you want to read
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
28,264 ratings · Top 5%
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 included17 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 Reading List: Book Tracker: 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
Allow users to create custom categories and tags for better organization.
Assumption to check: Limited customization for book categorization
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a social feature where users can share their lists and see friends' reading activities.
Assumption to check: Lack of social features for sharing reading lists
Validate with people who use this workflow before building.
Hypothesis 3
Provide more detailed tracking options like daily reading goals, reminders, and statistics.
Assumption to check: Inadequate goal tracking options
Validate with people who use this workflow before building.
Hypothesis 4
Integrate with popular eBook platforms for easier access to reading materials.
Assumption to check: No integration with eBook platforms
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
Easily track books you’ve read, books you’re reading, and books you want to read. Record your progress by adding the start and finish date of your books. ADD NEW BOOKS • Scan the barcode of a book to quickly add it to your list • Search online to find and add books • Alternatively, add a book manually by typing in its details • Sync your data between all devices via iCloud TRACK YOUR READING • Quickly log the dates you start and finish each book with a tap or swipe • Order the books, to help plan what to read next • Create your own custom lists, like "Wishlist", "Favourites", etc • Record the current page of books you're reading • Add your own rating and notes to each book • View your reading statistics PRIVATE & PERSONAL • No online account or signup needed • All data is private, stored on-device or in your iCloud account • Export and import all your data Some premium features require Reading List Pro, which can be purchased in the app. The app remains fully-featured when used without Reading List Pro. Terms of Use: https://readinglist.app/termsofservice Privacy Policy: https://readinglist.app/privacypolicy
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
Supabase
Zustand
react-native-reanimated
expo-router
BUILD KIT DIFFICULTY
Intermediate
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.
