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
RaMusi: Offline Music Player
RaMusi is the ultimate offline music player designed for music enthusiasts who love to discover, rate, and organize their favorite tunes
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
2,218 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 RaMusi: Offline Music 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
Integrate personalized recommendations based on user listening habits.
Assumption to check: Limited song discovery features compared to streaming apps.
Validate with people who use this workflow before building.
Hypothesis 2
Add features to share playlists or songs with friends.
Assumption to check: No social sharing functionalities.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a guided onboarding process to help users navigate the app.
Assumption to check: UI can be overwhelming for new users.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to create and manage their own playlists more intuitively.
Assumption to check: Lack of customizable playlists.
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
RaMusi is the ultimate offline music player designed for music enthusiasts who love to discover, rate, and organize their favorite tunes. With RaMusi, you can enjoy your personalized music library anytime, anywhere, even without an internet connection. RaMusi allows you to rate and score your tracks, adding a unique touch to your music management. Key Features of RaMusi: - Rate and Score: Create a personalized ranking system by rating each song based on your preferences, allowing you to organize your library accordingly. - Offline Music Player: Listen to your favorite tracks without the need for an internet connection. Enjoy uninterrupted music on the go. - Upload Your Favorites: Easily upload and store your favorite music tracks within the app, keeping all your cherished songs in one convenient place. - Music Collection: Build a comprehensive collection of your favorite tracks, sorted by your ratings. Effortlessly discover new favorites and revisit old ones. - User-Friendly Interface: Enjoy a seamless and intuitive experience with RaMusi’s easy-to-use interface. Uploading, rating, and managing your music has never been simpler. RaMusi is perfect for those who want to elevate their music experience with offline listening and personalized music management. Download RaMusi now and start building your personalized music library today! --------------------------------------------------------------------------- You can be a premium used and enjoy more cool features by auto-renewable subscription: • Length of subscription: 7 days, 1 year, and lifetime to access Premium servers, • Subscription Price: 7 Days Plan- $1.99（ramusi_week_vip） 1 Year Plan- $19.99（ramusi_year_vip） Lifetime Plan- $29.99 （ramusi_life_vip） Additional Subscription Information: - Subscription may be canceled at any time within the iTunes and App Store Apple ID Settings. All prices include applicable local sales taxes. - Payment will be charged to iTunes Account at confirmation of purchase. - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. - Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. ---------------------------------------------------------------------------- Terms of Use: https://ramusiapp.com/terms/ Privacy policy: https://ramusiapp.com/privacy/ If you have any problems, feel free to contact us: [email protected]
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
axios
@react-native-async-storage/async-storage
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.
