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 Quick - Mp3 Video Player
Music Quick - Easily download to your device and play your favorite trending music offline with easy to use features, the best way to organize you music.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
1,126 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 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 Music Quick - Mp3 Video Player: map the core Entertainment 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 full offline playback and downloads.
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Offer an ad-free premium experience.
Assumption to check: Ads can be intrusive
Validate with people who use this workflow before building.
Hypothesis 3
Integrate social sharing features.
Assumption to check: Limited social sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Enhance recommendation algorithms for better music discovery.
Assumption to check: Difficult to discover new music
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 Quick - Easily download to your device and play your favorite trending music offline with easy to use features, the best way to organize you music. Download music to your device and play it without internet (offline mode). Music Quick is a free music app that allows you to listen to your favorite music offline, on-demand, and anytime! Powerful functions: - Supports a wide variety of music styles - Background music playback in offline mode - Create your own playlist - Search for any song - Easily find your viewing history - Auto play next music - Repeat and shuffle songs - beautiful design Discover new music anytime Ready-made playlists with the latest songs from around the world. Organize Add unlimited songs to your own organized playlist. Music Quick Premium Provides: No Ads: No interruptions to music and videos (no ads) Annually Subscription: $12.99 Monthly Subscription: $2.99 If you subscribe via iTunes: Payment will be charged to iTunes Account at confirmation of the 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 at the rate of the selected plan. Subscriptions and auto-renewal may be managed by going to Account Settings after purchase. Terms of Service: https://www.offlinemusicplayer.net/terms Privacy Policy: https://www.offlinemusicplayer.net/privacy Please note: Music Quick is an offline music player App. It don't support online download songs or music streaming. The app does not download YouTube videos and does not play YouTube in the background.
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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
React Native
Expo
Zustand
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.
