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
FreeAudiobooks: Listen Now
Start listening in seconds — for free
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 4.6
240 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 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 FreeAudiobooks: Listen Now: 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
Offer exclusive content or partnerships to enhance the library.
Assumption to check: Limited audiobook selection compared to paid services.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a premium ad-free version.
Assumption to check: Ads in free versions can be disruptive.
Validate with people who use this workflow before building.
Hypothesis 3
Add a recommendation algorithm based on user preferences.
Assumption to check: Lack of personalization options for recommendations.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce advanced playback features like speed control, bookmarks, and sleep timers.
Assumption to check: Audio playback controls are basic.
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
Start listening in seconds — for free. From spicy romances to addictive thrillers, gripping dramas to riveting mysteries — there’s something for everyone. Save, download, and listen anywhere. Find your next obsession, fast - Browse trending picks, search by genre or author, and discover addictive audio stories. Key Features - 15,000+ Audiobooks: Explore a growing library of modern stories across popular genres. - Instant Listening: Start any audiobook in seconds. - Powerful Search: Quickly find stories by title, author, genre, or category. - Your Library: Save and organise favourites for quick access. - Offline Listening: Download audiobooks and listen without an internet connection. - Audio Player: Enjoy smooth playback, progress tracking, and easy controls. Why FreeAudiobooks? - Modern Stories: Discover addictive romances, thrillers, dramas, mysteries, fantasy, and more. - Fresh Updates: Our team adds new stories regularly, keeping your library fresh and exciting. - Curated Recommendations: Discover popular and trending audiobooks tailored to your interests. - Listen Anywhere: Enjoy stories while commuting, walking, relaxing, or winding down before bed. Perfect for Every Listener - Whether you’re relaxing at home, travelling, walking, or getting ready for sleep, FreeAudiobooks lets you discover, save, and enjoy audio stories your way. Build your audio library, follow your favourite genres, and escape into your next listen. Audiobooks+ - Listening is available without a subscription. FreeAudiobooks+ removes limits, ads and unlocks extra features. Subscriptions auto-renew unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple ID account settings. Terms: https://freeaudiobooksapp.com/terms Privacy: https://freeaudiobooksapp.com/privacy
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
Supabase
Zustand
axios
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.
