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
Offline music MP3: Asmr Musi
Tired of being restricted by Wi-Fi or network when listening to your favorite music?
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
1,712 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 included16 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 Offline music MP3: Asmr Musi: 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 smarter caching and offline management.
Assumption to check: Limited offline access to tracks.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the layout and enhance navigability.
Assumption to check: Cluttered user interface with too many options.
Validate with people who use this workflow before building.
Hypothesis 3
Focus on robust audio playback testing and optimization.
Assumption to check: Occasional playback issues and bugs.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate a recommendation engine for personalized playlists.
Assumption to check: Lack of personalized recommendations.
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
Tired of being restricted by Wi-Fi or network when listening to your favorite music? Imagine a world where you can immerse yourself in music anytime, anywhere, without relying on an internet connection. Now! We proudly present ASMR Musi, the ultimate solution for your music playback needs. Asmr Musi is an all-in-one audio app designed to provide users with a complete audio journey. The app brings together a variety of soundscapes such as the crunch of chewing, the rustle of turning pages, the sound of soft whispers, the warmth of wood, the crinkling of packaging, the melodies of instruments, the click of nails, the scribbles of pens, and more. Each auditory selection has been carefully curated to provide the best relaxation experience. The app has an intuitive and easy-to-use interface that easily guides users through various sound categories and allows users to save bookmarks based on their personal preferences. In addition, it allows users to enrich their listening experience and broaden their sound horizons by recording personal audio files. For those who want to keep their unique auditory moments forever, the in-app recording feature is a perfect solution. It allows users to capture, edit recordings, and manage their audio library by removing outdated tracks, ensuring a fresh and tailored listening experience at all times.
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
Redux
axios
react-navigation
expo-av
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.
