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
Sony | Music Center
- The center for all music lovers -
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
83,832 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 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 Sony | Music Center: 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 robust offline support with better caching.
Assumption to check: Limited offline playback options
Validate with people who use this workflow before building.
Hypothesis 2
Enhance the device connection process for smoother integration.
Assumption to check: Clunky device management
Validate with people who use this workflow before building.
Hypothesis 3
Improve the search feature for better accuracy and speed.
Assumption to check: Inconsistent search functionality
Validate with people who use this workflow before building.
Hypothesis 4
Provide an ad-free experience in premium tier.
Assumption to check: Ads in free version disrupt experience
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
- The center for all music lovers - Do you want to fully enjoy music whether at home or out and about? Then this Sony app is exactly what you've been waiting for. The Sony l Music Center app will singlehandedly enable you to listen to Hi-Res sound sources in the excellent audio quality. You can also connect to other Sony audio devices to play music in the best possible sound field, with the settings optimized for each individual device. To use the control function of audio devices, an audio device compatible with Sony | Music Center is required. Please check if your audio products are compatible with Sony | Music Center from our support site. Devices that were compatible with SongPal are compatible with Sony | Music Center as well. Main Feature You can playback music including Hi-Res tracks on your smartphone. Play the music contents from CD, USB, and Smartphone. Access music by browsing or searching music folders stored on your computer or NAS drive thru network(DLNA)*. You can set Multi-room, Surround, Stereo wirelessly with multiple speakers.* Change the setting on the audio device, such as Equalizer, Sleep Timer, Network* and so on. *Limited to compatible devices. This application supports VoiceOver. Note * Starting with version 7.4 of this app, it is only available on iOS 15.0 or later. Some features may not be supported by certain devices. With the update to ver.5.2, Music Center will no longer be compatible with STR-DN850/STR-DN1050/ICF-CS20BT/XDR-DS21BT. Some functions and services may not be supported in certain regions/countries. Please make sure to update Sony | Music Center to the latest version.
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.
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BUILD KIT DIFFICULTY
Advanced
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.
