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
ListenBook Pro: book player
Play your own audiobooks on iPhone, iPad, and Apple Watch.
$24.99 · In-app purchases
PRICE
$24.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
21 ratings · Top 15%
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/
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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 ListenBook Pro: book player: 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
Implement personalized recommendations based on user preferences.
Assumption to check: Limited audiobook discovery features
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a tiered subscription model to cater to different budgets.
Assumption to check: High price point for premium access
Validate with people who use this workflow before building.
Hypothesis 3
Add functionality for users to share audiobooks with friends.
Assumption to check: Lack of social features for sharing audiobooks
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to download audiobooks for offline access.
Assumption to check: No offline listening capabilities
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
Play your own audiobooks on iPhone, iPad, and Apple Watch. Any format — no conversion needed. Listen on Watch without your iPhone. Free books via LibriVox, built in. ••• The app does not feature any audiobooks, but only plays your own audio files ••• The purpose of this app is to make listening to audiobooks in different formats easy and convenient! There are lots of websites with all kinds of audiobooks dubbed by professional actors and enthusiasts. Most of such audiobooks are distributed as folders with multiple audiofiles in different formats. I'm, the author of the app, listen to audiobooks all the time. Therefore, I did my best to make ListenBook a tool that has everything necessary to make this process intuitive and convenient. • Plays audiobooks in MP3, MP4, OPUS, OGG, FLAC, AWB, M4B, M4A, WMA, AAC formats (without DRM protection). • A full standalone player on your wrist. Download books to your Watch via Wi-Fi and listen without your iPhone nearby. Switch between standalone and remote control modes with one tap. Browse chapters and your Watch library right from your wrist. • Adjustable playback quality (0.5x to 5.0x). • Changing the timbre of the reader's voice • LibriVox.org integration. Tens of thousands of public domain books are available to download and listen to in ListenBook for free. • Intelligent noise reduction • Support for chapters from OverDrive • Binaural audio processing to reduce fatigue when listening to books/music through headphones (available when using the Universal audio engine) • Boost sound ( for audiobooks with low volume ) • The book cover is loaded from an image file in the book’s folder or from an embedded image from an audio file. • Automatically saves the current playback position for all audiobooks. • Supports CarPlay and integrations with over 50 other car models from Ford, GM, Mazda, BMW, Jaguar, Landrover and many more • Jump to any file (can be enabled in settings). • Supports standard headphone controls. • Widgets for the desktop and lock screen (available from iOS16+) • Supports Apple Watch. • Playback control from the Control Center and Block screen. • A sleep timer with adjustable sleep periods or sleep after the end of the current chapter. • Possibility to add/remove books through iTunes and from the computer via Wi-Fi • Support WebDav for adding audiobooks directly from Explorer on PC or from Finder on MacOS If you enjoy ListenBook, we would be glad if you consider writing a review.
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
Supabase
React Navigation
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.
