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
Melodista Music Offline Player
A First Music Player without interruptive ADS
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
38,969 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 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 Melodista Music Offline 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
Enhance offline capabilities with better management features.
Assumption to check: Limited offline access to music libraries
Validate with people who use this workflow before building.
Hypothesis 2
Implement personalized music recommendations.
Assumption to check: Lack of song discovery features
Validate with people who use this workflow before building.
Hypothesis 3
Offer a more seamless experience with an ad-free subscription option.
Assumption to check: In-app ads can disrupt listening experience
Validate with people who use this workflow before building.
Hypothesis 4
Design a more intuitive onboarding process and navigation flow.
Assumption to check: Complex navigation for new users
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
A First Music Player without interruptive ADS Melodista is a player for music lovers. Optimized to match cutting edge iOS user experience, integrated with the latest system technologies. A simple Playlist system ensures that you will be able to easily access your music and arrange them in a way you like. Collect all your music from your authorized sources in one app. Melodista player is fast and efficient. Top features: - Create and organize folder playlists - Import tracks from clouds and Files app - Manage, copy, move, rename and transfer files - Supports many audio formats - Edit Song Picture and name - Share with friends - Use sleep timer at night - Dark Mode - All popular player controls - Player gets updated every two weeks with new features - Designed for iOS users, full iOS 13 and iPhone support Pro Account Subscription: - $1.49 per month for US. Prices in US dollars, may vary in countries other than U.S.and are subject to change without notice. Payment for Melodista offline player Pro Account subscriptions will be charged to your iTunes account at the time of purchase. Your subscription will be automatically renewed monthly. Canceling the trial period will immediately disable your subscription. Payment for subscription renewals will be charged to your account within 24 hours prior to the end of the current period. You can disable subscription renewal in your iTunes account settings on your device. By tapping "Start Trial" or "Buy Now" you confirm that you have read the Terms of Use and the Privacy Policy and agree to be bound by their terms. Privacy policy: https://kickbeatmusic.com/privacy-policy-2/ Terms of use: https://kickbeatmusic.com/terms-and-conditions/
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
React Navigation
Axios
React Native Async Storage
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.
