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
WINdowsAMP, The Old School
Instant nostalgia
$0.99 · In-app purchases
PRICE
$0.99
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 WINdowsAMP, The Old School: 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
Implement robust offline downloads and caching.
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Create a more intuitive bottom tab navigation.
Assumption to check: Poor navigation structure
Validate with people who use this workflow before building.
Hypothesis 3
Add options for sharing music and playlists on social media.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Integrate background audio playback for seamless experience.
Assumption to check: No background playback support
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
Instant nostalgia. Classic WINdowsAMP-style design with modern iOS polish. Retro equalizer. Local files. Zero ads. Own your music. Plays files you add. Works offline. Sound your way. 10-band parametric EQ, presets, and loudness you control. No clutter. No ads, accounts, or streaming lock-in. True file-based library: add MP3/AAC/FLAC/WAV/M4A from the Files app or iCloud Drive. Precise playback engine: gap-free start/stop, reliable seek, and background audio. Live visualizers: bar spectrum, oscilloscope, and waveform with neon glow. Persistent playlists: quick “Add” from Recents, auto-saved order, easy clear or delete. Classic transport: shuffle, repeat-one, repeat-all, previous/next, stop, and play/pause. System integration: Lock Screen controls, Control Center, and headset/CarPlay remote commands. Volume + EQ control in one screen for fast tuning. Tutorial for first-time setup with legal free-music sources. 100% local playback. No subscriptions. Zero analytics by default. No sign-in. Designed for one-hand use with big transport buttons and readable monospaced text. Retro look without skeuomorphic lag. Smooth, 60-fps visual feedback. 10-band EQ with on/off toggle and presets. Real-time spectrum bars and oscilloscope. Shuffle, repeat modes, and persistent volume. Playlist manager with play and delete per track. File picker with multi-select. Stereo indicator, elapsed and remaining time, mm:ss display. Offline-first architecture. Download songs to Files. Tap Add in the app and select tracks from Recents. Press Play. Your playlist is saved and persistent.
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-av
async-storage
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.
