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 HQ +
FEATURED ON CNET—this is *the* app for busy people who have a graveyard of eBooks (you know who you are, you well-meaning intellectual, you.)
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
2,381 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 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 Audiobooks HQ +: 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
Focus on expanding library and exclusive content.
Assumption to check: Limited audiobook selection compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Implement onboarding and guided tours.
Assumption to check: Difficult navigation for new users.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize audio streaming performance.
Assumption to check: Occasional playback issues.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the subscription UI and provide clear pricing information.
Assumption to check: In-app purchase process can be confusing.
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
FEATURED ON CNET—this is *the* app for busy people who have a graveyard of eBooks (you know who you are, you well-meaning intellectual, you.) ROAD TRIP? TRAIN RIDE? JUST TRYING TO TUNE OUT THE PERSON SITTING NEXT TO YOU ON THE PLANE? ;) With over 600,000 premium audiobooks, and 120,000 free, you can get your wisdom on—and politely protect your headspace. IT’S LIKE MUSIC...ERRR, NARRATION TO YOUR EARS. From the latest bestsellers, to timeless classics, to up and coming indie authors, Audiobooks HQ is the app for a massive selection of studio-recorded quality audiobooks, at your fingertips. Or should we say earbuds? ON DEMAND, NO SUBSCRIPTION REQUIRED Just open, search, click and listen. There are no credits and no recurring monthly fees. Audiobooks HQ lets you download and listen on demand, wherever you are, whenever you're ready. Even find the top rated books with the click of a button, or switch the language and get your Spanish on! FANCY FEATURES YOU’LL WANT TO BRAG ABOUT TO YOUR FRIENDS Audiobooks HQ even does neat tricks like adjusts the speed, slows down or speeds up playback in 40 increments (without affecting pitch!), and even sets a sleep timer when it's time for bed. BONUS: ACCESS 109,000 EPISODES OF OLD TIME RADIO, TOO! It's the best radio dramas of the 1930's, 1940's, 1950's and more. Because what's modern technology without a little old-school entertainment? GREAT FOR AROUND THE HOUSE, TOO! Washing the car. Check. Washing the dog. Probably that, too. Whether you're logging some miles on the ol' treadmill, or logging 'em driving cross country, we're the companion you didn't know you needed. (Sorry, dog.)
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
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expo-av
@supabase/supabase-js
BUILD KIT DIFFICULTY
Expert
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.
