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
Musa Player
Musa is a clean and easy-to-use music player for Subsonic/Navidrome servers
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
4 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 included18 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 Musa Player: 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 personalized recommendations and curated playlists.
Assumption to check: Limited music discovery features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Add offline download options for songs and playlists.
Assumption to check: No offline listening capabilities
Validate with people who use this workflow before building.
Hypothesis 3
Focus on a more user-friendly design with better navigation.
Assumption to check: Poor user interface design and navigation
Validate with people who use this workflow before building.
Hypothesis 4
Integrate social sharing options for users to share their music.
Assumption to check: Lack of social sharing features
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
Musa is a clean and easy-to-use music player for Subsonic/Navidrome servers. Stream your self-hosted music library and keep ownership of your collection. Stream & Download Stream your entire collection over WiFi or cellular with adaptive quality settings. Choose your preferred codec and bitrate, or download albums and playlists for offline listening — in original quality or transcoded to save space. Synced Lyrics Follow along with time-synced lyrics that highlight each line as it plays. Musa automatically fetches lyrics so you can sing along to every track in your library. Smart Playback Gapless playback, shuffle, repeat, and an autoplay feature that keeps the music going based on genre. Your queue and play history are always at your fingertips. CarPlay Ready Take your library on the road. Musa integrates with Apple CarPlay so you can browse, play, and control your music safely from your car's display. Designed for iPhone & iPad A native SwiftUI interface that feels right at home on both iPhone and iPad, with a full-screen now playing view, mini player, and customizable home screen sections. Key Features - Connect to any Subsonic or OpenSubsonic-compatible server - Offline downloads with background download support - Adaptive streaming quality (WiFi vs. cellular) - Time-synced lyrics - Gapless playback - CarPlay support - Customizable home feed (favorites, recently added, recently played, random albums) - Full search across songs, artists, albums, and playlists - Star and rate your music - Scrobbling support - AirPlay integration Musa is made for music lovers who host their own library. No subscriptions. No ads. Just your music, sounding exactly the way you want it.
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
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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.
