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
WAV to MP3 Converter
WAV to MP3 Converter
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 WAV to MP3 Converter: map the core Music 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 to support more audio formats like AAC and FLAC.
Assumption to check: Limited formats supported for conversion
Validate with people who use this workflow before building.
Hypothesis 2
Implement notifications or alerts post conversion.
Assumption to check: No user feedback on conversion success
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to convert files without an internet connection.
Assumption to check: Lack of offline functionality
Validate with people who use this workflow before building.
Hypothesis 4
Add features to share converted files directly.
Assumption to check: No social sharing options
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
WAV to MP3 Converter Easily convert your WAV audio files to high-quality MP3 format with just a few taps! Whether you're a music enthusiast, a podcast creator, or a professional sound editor, this app is your go-to tool for seamless audio conversion. Key Features: Fast & Efficient Conversion: Convert WAV files to MP3 quickly without compromising on audio quality. Customizable Settings: Adjust audio codec, bitrate, sample rate, channels, and volume to suit your needs. Share & Save: Save your converted MP3 files directly to your device or share them via email etc. User-Friendly Interface: Intuitive design with a sleek gradient background for a modern and professional look. Progress Tracking: Monitor the conversion process in real-time with a progress bar and percentage indicator. Why Choose WAV to MP3 Converter? High-Quality Output: Enjoy crisp and clear MP3 files with customizable bitrate and sample rate options. No Ads: Focus on your work without interruptions. Offline Functionality: Convert files anytime, anywhere, without needing an internet connection. Perfect For: Musicians and producers looking to convert studio recordings. Podcasters needing to optimize audio files for distribution. Anyone who wants to reduce file sizes without losing audio quality.
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
react-navigation
expo-file-system
react-native-progress
react-native-video
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.
