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
BookOwl: Reading Tracker
Track your reading life with the app that actually gets out of your way.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 5.0
21 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 BookOwl: Reading 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
Enhance book detail with more metadata like ratings and reviews.
Assumption to check: Limited book details and metadata
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate offline storage to track progress without internet.
Assumption to check: No offline access to reading progress
Validate with people who use this workflow before building.
Hypothesis 3
Offer more flexible subscription options or features.
Assumption to check: In-app purchase limitations
Validate with people who use this workflow before building.
Hypothesis 4
Integrate social sharing options for users to share book recommendations.
Assumption to check: Lack of social 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
Track your reading life with the app that actually gets out of your way. BookOwl makes it effortless to build your personal library, track what you're reading, and discover your next favorite book — all without the clutter. IMPORT YOUR LIBRARY INSTANTLY Switching from Goodreads? Bring everything with you. Import your entire reading history, ratings, and shelves in one tap. No data left behind. SCAN BOOKS IN SECONDS Point your camera at any barcode. BookOwl identifies it instantly and adds it to your library. Stack of books to add? Scan them all in one session. RATE WITH PRECISION Half-star and quarter-star ratings. No more agonizing over whether a book is a 3 or a 4. Rate exactly how you feel. ORGANIZE YOUR WAY Create custom shelves for any purpose — "Beach Reads," "Book Club," "Lent to Friends" — alongside smart reading statuses. Filter and search to find any book in seconds. DISCOVER YOUR READING IDENTITY BookOwl goes beyond stats. Your Reading Autobiography captures your journey as a reader — the themes you love, how your tastes have evolved, and the story your bookshelf tells about you. FIND YOUR NEXT READ Get personalized recommendations based on your history. Explore author pages, browse multiple editions, and discover new voices. BUILT FOR READERS, NOT ADVERTISERS No ads. No engagement tricks. Just a calm, thoughtful space for your reading life. What you'll find: - Barcode scanner — add books in seconds - Goodreads CSV import - Half-star and quarter-star ratings - Custom shelves and collections - Reading progress tracking with page counts - Yearly reading goals and streaks - Reading Autobiography and personality insights - Personalized book recommendations - Private notes on any book - Multiple editions support - Detailed author pages - Favorite book showcase on your profile - Follow friends and see what they're reading - Multiple themes and app icons - And more Whether you read 5 books a year or 50, BookOwl helps you remember every one. Start building your reading story today.
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 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.
