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
Cs Music Pro
Cs Music Pro reimagines the classic iOS Music app—updated, enhanced and ad-free.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
1,825 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.
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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 included17 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 Cs Music Pro: 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
Offer more robust free tier with ad-supported music.
Assumption to check: Limited free features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing to enhance user engagement.
Assumption to check: No social sharing options
Validate with people who use this workflow before building.
Hypothesis 3
Simplify playlist creation and editing processes.
Assumption to check: Clunky playlist management
Validate with people who use this workflow before building.
Hypothesis 4
Optimize streaming algorithms for better audio quality.
Assumption to check: Inconsistent audio playback quality
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
Cs Music Pro reimagines the classic iOS Music app—updated, enhanced and ad-free. Experience the familiar tabbed interface you loved, enhanced with powerful features and seamless Apple Music integration. Effortless control: • Intuitive organization: Browse by artists, albums, playlists and more. • Advanced customization: Powerful sort and grouping options make managing large libraries easy. • Quick filters: View new additions, recent plays, or favorited songs with just a tap. • Pin your favorites: Convenient access to the artists and albums in heavy rotation. Rediscover your music: • Dive deeper with metadata and lyrics: Explore your library in more detail. • Classic star ratings: rank and order your tracks the old-school way. Beautifully designed interface: • Dynamic player: Immerse yourself with album artwork-based colors. • iOS-native: Feels right at home alongside your stock apps, and respects accessibility settings. Cs Music Pro is perfect for those who: • Love their music collection: You've ripped your CDs, downloaded your favorites, and curated your library over the years. Cs Music Pro gives you the power to organize and enjoy it your way. • Value control and a curated library: You want more than just a basic music player. You want fine-grained control over how your music is organized, presented, and enjoyed. • Want a pure, ad-free listening experience: No interruptions, no distractions. Just you and your music. • Use the Music.app library: You use the built-in Music app to manage your music, whether you subscribe to Apple Music or not. Cs Music Pro enhances that experience with a classic interface and powerful features. (Note: Cs Music Pro requires the use of your existing Music.app library. It is not a standalone music player.) Download Cs Music Pro today and rediscover the joy of your music.
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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
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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.
