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
Audio Tag Editor - MP3 & ID3
Edit and organize your audio file metadata
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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 included19 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 Audio Tag Editor - MP3 & ID3: 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 file format compatibility beyond MP3 and ID3.
Assumption to check: Limited file format support for editing tags.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce batch editing feature for multiple files.
Assumption to check: No batch editing functionality.
Validate with people who use this workflow before building.
Hypothesis 3
Add audio preview functionality for better user experience.
Assumption to check: Lack of audio preview before saving changes.
Validate with people who use this workflow before building.
Hypothesis 4
Clarify in-app purchase options and value proposition.
Assumption to check: In-app purchase confusion.
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
Edit and organize your audio file metadata. Audio Tag Editor lets you update tags, cover art, and track details quickly and locally. Audio Tag Editor is an offline utility for managing music libraries. It works directly on your files and lets you make changes without needing an internet connection. Features • Wide format support: Edit metadata for MP3, MP4, FLAC, WAV, AIFF, OGG, OPUS, and more. • Smart auto-fill: Fill in track details and artwork with one click using our verified online sources. • Flexible metadata: Add, edit, or remove any standard or custom tag field. • Cover art: Add, replace, or remove artwork directly in your audio files. • Batch editing: Apply changes to multiple tracks at once. • Tag compatibility: Supports ID3v1, ID3v2, MP4 tags, Vorbis comments, APE tags, and more. • Cross-platform: Buy once and use on Mac, iPhone, and iPad. • Local processing: All edits are done on your device. No files are uploaded. A simple way to edit and organize your music library.
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
Zustand
react-navigation
expo-document-picker
expo-image-picker
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.
