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
BookTree: bookshelf & note
"BookTree App supports your reading life via managing books and your underlines"
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.1
15 ratings · Top 30%
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/
Preview a sample Build Kit No email needed
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 BookTree: bookshelf & note: 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 rich text formatting and tagging.
Assumption to check: Limited customization for notes.
Validate with people who use this workflow before building.
Hypothesis 2
Implement real-time syncing across devices.
Assumption to check: Sync issues when adding books.
Validate with people who use this workflow before building.
Hypothesis 3
Improve UX with a better search and filter system.
Assumption to check: Difficult navigation between books.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a freemium model with essential features free.
Assumption to check: High subscription cost for premium features.
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
"BookTree App supports your reading life via managing books and your underlines" MANAGE BOOKS • list books in table or in bookshelf style • collect books by your own category • filter books by own, borrowed, wanted, read or not • manage own book format (paper, ebook, audio book) SEARCH BOOKS • add book information easily via barcode scan or search title, author,ISBN or manually • view book information on online (Google Books, Amazon, Goodreads) WRITE NOTE, UNDERLINE • save text or picture what you want to get underline • highlight favorite passage on photo • list all underlines among books READING STATISTICS AND GOAL • view reading statistics by year or month and book list what you read • set reading goal and keep track of goal progress by monthly or annually • view badge count for unread, reading books SHARE •share book info. or underline via email , twitter, facebook, SMS BACKUP & RESTORE • backup database to cloud (dropbox, google drive, etc) • backup database via email • backup /restore database via iTunes Lock • lock your BookTree app with your passcode. • unlock with your device's Touch ID or Face ID. • Please refer to Help, if you lost passcode. * Please feel free to send us any inconveniences or suggestions at any time via Settings> About App > Contact Supports * Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula
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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
@react-native-community/image-picker
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.
