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
AudiobookCast
audiobookCast: The Ultimate DRM-Free Audiobook Player
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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 included15 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 AudiobookCast: 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 niche genres or community-driven audiobook submissions.
Assumption to check: Limited library of audiobooks compared to larger platforms
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation and prioritize core functionalities.
Assumption to check: User interface may feel cluttered with too many features
Validate with people who use this workflow before building.
Hypothesis 3
Implement robust syncing and playback controls.
Assumption to check: Inconsistent playback experience across devices
Validate with people who use this workflow before building.
Hypothesis 4
Offer a freemium model to attract more users.
Assumption to check: High subscription cost without a free tier
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
audiobookCast: The Ultimate DRM-Free Audiobook Player Description audiobookCast is the audiobook player designed for listeners who own their stories. Import, organize, and enjoy your entire DRM-free collection with powerful playback tools, smart bookmarking, and complete library control — no subscriptions, no restrictions. Built for serious listeners and collectors alike, AudiobookCast gives you everything you need to enjoy audiobooks the way you want — on your iPhone or iPad, online or offline. Seamless Playback Control Adjustable playback speed (0.5× – 3×) 15-second rewind / 30-second skip forward Sleep timer with “end of chapter” option AirPlay support for wireless playback Smart Bookmarks Instantly save key moments while listening Label and jump to any bookmark easily Automatic resume from last position Powerful Library Management Import DRM-free audiobooks (MP3, M4B, M4A, AAC, FLAC) Automatically detects chapters and cover art Edit metadata (title, author, series, publication year) Sort by title, author, date added, or duration Custom Collections Group books by series, author, or theme Enable auto-download for selected collections Filter by downloaded or recently played titles Play Queue & Up Next Queue multiple audiobooks for continuous listening Auto-play the next book in sequence Reorder your queue with simple drag-and-drop Offline Listening Download your entire collection for travel or low-signal areas Manage storage with clear file indicators Enjoy uninterrupted playback anywhere Why AudiobookCast AudiobookCast gives audiobook collectors and serious listeners complete control over their libraries. Free from DRM and streaming limits, it’s built for those who value independence, organization, and a focused listening experience. Compatibility Requires iOS 17.0 or later. Compatible with iPhone and iPad.
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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
Zustand
React Navigation
TypeScript
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.
