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
Music : Music Streaming
Music Player makes it easy to search, discover, and enjoy your favorite music in one clean, fast, and simple app.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
1,085 ratings · Top 15%
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/
Preview a sample Build Kit No email needed
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 Music : Music Streaming: 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 a more advanced search algorithm with filters and suggestions.
Assumption to check: Users often report difficulty finding specific songs or artists.
Validate with people who use this workflow before building.
Hypothesis 2
Improve the audio handling and buffering mechanism.
Assumption to check: Background audio playback can be glitchy.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance offline support by allowing song downloads.
Assumption to check: Limited offline functionality.
Validate with people who use this workflow before building.
Hypothesis 4
Offer a more user-friendly ad experience with less frequency.
Assumption to check: Ad experience can be intrusive.
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
Music Player makes it easy to search, discover, and enjoy your favorite music in one clean, fast, and simple app. Browse top songs, search across songs, videos, albums, and playlists, and build your own personal library with favorites, recently played tracks, and custom playlists. Whether you want to explore something new or jump back into what you already love, Music Player keeps everything organized and easy to reach. Enjoy a smooth full-screen player with a mini player, playback queue, progress controls, and a modern listening experience designed for everyday use. You can also personalize the app with dark mode, language selection, equalizer controls, and a sleep timer. Features Search songs, videos, albums, and playlists Explore trending and popular music Save favorites and create your own playlists Access recently played tracks anytime Smooth mini player and full-screen player Playback queue for better listening control Equalizer settings for a personalized sound Sleep timer for late-night listening Dark mode and multi-language support Premium option for an ad-free experience Music Player is built for listeners who want a simple, elegant, and flexible way to enjoy music every day. Eula : Privacy Policy : https://sites.google.com/view/musciplayersong-eula-pp/home Terms of use : https://sites.google.com/view/musicplayer-eula-tt-song/home
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
Async Storage
react-navigation
expo-av
axios
BUILD KIT DIFFICULTY
Expert
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.
