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
BookCraft Audio
BookCraft is an audiobook reader and converter, designed from the ground up with accessibility in mind
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included16 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 BookCraft Audio: 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 the catalog with more titles and genres.
Assumption to check: Limited selection of audiobooks compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation with clearer labels and fewer tabs.
Assumption to check: Complex navigation structure may confuse users.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a download feature for offline access.
Assumption to check: No offline listening support.
Validate with people who use this workflow before building.
Hypothesis 4
Add a recommendation engine based on user preferences.
Assumption to check: Lack of personalized recommendations.
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
BookCraft is an audiobook reader and converter, designed from the ground up with accessibility in mind. Whether you listen with VoiceOver or by touch, it makes listening simple, comfortable and enjoyable. Many formats supported • DAISY 2.02 and DAISY 3 books. • Compressed ZIP archives. • Ready-made audio files: MP3, M4A, M4B, WAV. External libraries • Download books directly from your favorite websites, right inside the app. • Built-in browser that remembers your sign-in. • Download progress, with the percentage announced aloud. • Automatic import into your library once the download finishes, with spoken updates at every step. • After a book finishes, you return to the library's home page to quickly look for the next one. Smart conversion • Convert into a single M4B file. • Save space on your device, ideal for large books. • Automatic volume normalization, for steady sound across all chapters. Full listening control • Adjustable skip step, from 5 seconds up to 15 minutes. • Playback speed control, up to 3x. • Sleep timer that pauses when you pause and resumes where it left off. • Custom sleep timer: set the exact hours and minutes with sliders. • The sleep timer restarts automatically after it ends, on the next play. • The sound fades out gently before the timer stops, instead of cutting off. • Chapter and page navigation. • Bookmarks to return to favorite spots. • Two progress bars: for the book and for the current chapter. • External keyboard shortcuts for comfortable control without the screen. Organization • Status for each book: unread, reading, finished. • Quickly continue your last book by pressing and holding the app icon. Sharing • Export to M4B to send to others. • M4B files also play in Apple's Books app, as well as many other apps. Built for accessibility • Full VoiceOver support with clear labels. • Friendly spoken times. • Respects the system text size and Increase Contrast settings. • Built-in user guide. Available in Greek, English, German, French, Spanish and Italian, for iPhone and iPad. If you find BookCraft useful, please leave a 5-star review — it helps us keep improving it!
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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
Supabase
React Navigation
Zustand
React Native Reanimated
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.
