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
Audiobooks - 5,239 Classics Ready to Listen
This is the top rated audiobook app on the planet
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.1
11 ratings · Below Average
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 Audiobooks - 5,239 Classics Ready to Listen: 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
Expand the library to include more titles and genres.
Assumption to check: Limited audiobook selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more visually appealing design with better navigation.
Assumption to check: User interface is not very engaging
Validate with people who use this workflow before building.
Hypothesis 3
Add advanced playback features like speed control and sleep timers.
Assumption to check: Playback controls are basic
Validate with people who use this workflow before building.
Hypothesis 4
Focus on optimizing performance and stability.
Assumption to check: Frequent crashes reported by users
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
This is the top rated audiobook app on the planet. Browse our handpicked collections, download any one of 5,239 classic audiobooks, and listen with our fully featured audiobook player. On the go? We save your place automatically. Enjoy the unique design with a retro feeling. We've crafted handpicked collections to make browsing a snap, and commissioned hundreds of custom covers to bring you Cover Mode. This is the world of public domain audiobooks like never before. Unlike other "free" apps that charge you $10 an audiobook, with Free Audiobooks once you pay, everything's included. No limits! No download caps. 5,239 classic audiobooks, in your pocket, for less than a cup of coffee. Features: * Audiobooks. Free Audiobooks! The plays of Shakespeare, the letters of leaders, the autobiographies of Franklin and Teddy Roosevelt, the collected works of geniuses, the philosophy of Seneca and Plato. It's all here, along with thousands and thousands of other audiobooks. * A Perfect Audiobook Player. It's beautiful, fast, and fully featured. Background listening, 30 second rewind, chapter listings, and more! * Handpicked Collections. Mystery, Theology, Epic Epics, Poetry, Philosophy, Children's, War… the list goes on. We have 36 hand picked collections to make finding great books a cinch. * Magic Downloading. Find something you like. Tap 'Download and Listen'. We'll immediately download the first chapter, and a few chapters ahead. Finish a chapter? We'll download another. We're sure to always download three chapters ahead- that way you'll never be without something to listen to. * Road Trip Ready. Going on a road trip or flight? Just tap 'Download All' and we'll download the whole audiobook in one go. * Original Covers. We make public domain books come alive with absolutely beautiful covers. If you have any questions or suggestions don't hesitate to drop us a line at [email protected] that's what we're here for! ***** Exceptional! An exceptional collection of classic books. These are the books that have withstood the test of time and must be read by all who wish to be liberally educated. ***** Very nice app. Easy to use and I am reading/listening to books I have known about forever but just never found the time to read. Now I can enjoy them. I recommend this app to everyone. Now maybe I can get a few more answers right on Jeopardy. ***** Great updates-use this all the time Enjoyable, user friendly, a constant in my studio. Company listens to its users. Have recommended to friends. ***** above quotes are recent 5 start rings on the app store *****
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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/native
react-native-reanimated
expo-av
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.
