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
BookBuddy Pro: Book Tracker
BookBuddy is a powerful book management app that gives you access to your entire book catalog, anywhere
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
5,970 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included19 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 BookBuddy Pro: 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
Add social sharing and community features to enhance user engagement.
Assumption to check: Limited social features for sharing progress with friends.
Validate with people who use this workflow before building.
Hypothesis 2
Implement AI-driven book recommendations based on user preferences.
Assumption to check: Lack of personalized recommendations.
Validate with people who use this workflow before building.
Hypothesis 3
Offer more flexible payment options or premium content to increase user retention.
Assumption to check: Inflexible subscription model.
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
BookBuddy is a powerful book management app that gives you access to your entire book catalog, anywhere. Using BookBuddy is fun and easy, allowing you to quickly find any book in your library, share your favorite books, and keep track of borrowed and lent books. KEY FEATURES • Adding Your Books Add your books using the following options: - Scan barcode (via iPhone camera or Bluetooth handheld scanner) - Enter ISBN - Search online by keyword - Add manually - Import from CSV file • Organizing Your Books Place your books where they belong: - My Books — books you own - Wish List — books you wish to own - Borrowed — books you borrowed from others - Previously Owned — books you no longer own • Syncing Your Library Sync your library across multiple devices using iCloud or Dropbox sync. • Sharing Your Library Share your library online via the BookBuddy Companion website and invite anyone to view it (requires a monthly subscription). • Unlocking Your Reading Insights Deep dive into your reading habits by exploring the following statistics: - Books Finished — Track the number of books you’ve completed - Pages Read — See your page count over time - Top Authors — Discover your most-read authors - Favorite Genres — Identify your preferred genres MORE TO LOVE • Universal app — pay once and use BookBuddy on your iPhone, iPad, and Apple Silicon Mac. • Personalize — use categories and tags, mark favorites, add personal notes, and much more. • Appearance — choose either list or grid view to best match your needs. • Custom Filters — filter your library by multiple criteria. • Advanced Sorting — apply multi-level data sorting. • Loans — instantly track books that are currently loaned out. • Multiple selection — apply batch operations using multiple selection. • Reading Status — filter your books by their reading status. • Quick find — instantly find books by entering search keywords or scanning their barcodes. • Export — quickly export your library into CSV, PDF, or HTML formats. • Print — easily print selected books to AirPrint-enabled printers. • Backup — create backups to any cloud service. • Activity History — view the full history of your reading and loaning activities. • Duplicates — quickly detect duplicates and easily remove them. • Markdown Formatting — style your notes with headings, lists, bold, italics, links, and more. • Privacy — your library is saved locally and privately on your device. • And so much more! CLASSROOM LIBRARY MANAGER (for teachers) • Manage — use BookBuddy to manage your classroom library and track student checkouts. • Checkout History — easily track checkout history and view statistics. • Contacts — save your student names in BookBuddy Contacts rather than in your personal Contacts app. • Reading Level Fields — use various fields to track the reading level of your books. • Online Sharing — allow students to self-checkout books via the BookBuddy Companion website (requires a monthly subscription). FEEDBACK We love staying in touch with our users and we look forward to hearing from you! If you have any feedback, questions, or concerns, please email us at: [email protected] or visit: http://www.kimicoapps.com/support.html Follow us on Facebook: http://www.facebook.com/KimicoLtd * Privacy policy: https://www.iubenda.com/privacy-policy/12652322 * Terms and Conditions: https://www.iubenda.com/terms-and-conditions/12652322
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
React Native Reanimated
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.
