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
MP3 Audiobook Player Pro
MP3 Audiobook Player is the easiest and most convenient app for listening to audiobooks in MP3, MP4, AWB, OPUS, OGG, FLAC, AWB, M4B, M4A formats on your iPhone, iPod Touch or iPad!
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.1
230 ratings · Top 30%
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included19 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 MP3 Audiobook Player Pro: 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
Include support for more formats like M4B, WAV.
Assumption to check: Limited audiobook format support
Validate with people who use this workflow before building.
Hypothesis 2
Add a sleep timer functionality.
Assumption to check: No sleep timer feature
Validate with people who use this workflow before building.
Hypothesis 3
Enhance UI with modern design patterns.
Assumption to check: Basic UI design
Validate with people who use this workflow before building.
Hypothesis 4
Optimize performance for large audiobook collections.
Assumption to check: Inconsistent performance with large libraries
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
MP3 Audiobook Player is the easiest and most convenient app for listening to audiobooks in MP3, MP4, AWB, OPUS, OGG, FLAC, AWB, M4B, M4A formats on your iPhone, iPod Touch or iPad! ••• 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 MP3 Audiobook Player a tool that has everything necessary to make this process intuitive and convenient. • Plays audiobooks in MP3, MP4, OPUS, OGG, FLAC, AWB, M4B, M4A formats (without DRM protection). • Adjustable playback quality (0.5x to 5.0x). • 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. • 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 MP3 Audiobook Player, 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
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zustand
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.
