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
MusicStreamer
Rediscover your Music Library with MusicStreamer.
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
560 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 included19 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 MusicStreamer: 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
Offer more flexible offline download options.
Assumption to check: Limited offline access to music
Validate with people who use this workflow before building.
Hypothesis 2
Provide ad-free experience with premium subscription tier.
Assumption to check: Ads can interrupt playback
Validate with people who use this workflow before building.
Hypothesis 3
Implement more efficient search algorithms and caching.
Assumption to check: Search functionality can be slow
Validate with people who use this workflow before building.
Hypothesis 4
Add features for sharing playlists and tracks with friends.
Assumption to check: Lack of social sharing options
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
Rediscover your Music Library with MusicStreamer. "One of the best music streaming apps available for the iOS operating system." - appPicker.com "A smart, new app that makes local music streaming easier than ever." - AppAdvice.com “A fantastic answer to a common problem” - 148Apps Do you have a music collection with thousands of files on your PC, Mac, Network Drive or Time Capsule? Now you can play that music directly on your iPad / iPhone without syncing. MusicStreamer will scan your music, display beautiful album artwork and is a joy to use. Our setup wizard will have you connected to your music in no time. Create multiple music collections such as your main collection at home and a WiFi drive in the car. Easily switch between them. Easily create and edit new playlists. Import Playlists. MusicStreamer can import m3u and m3u8 playlist files. Export MusicStreamer playlists to iTunes. Filter your music by genre or search for your favourite song, artist or album. Download tracks, albums or playlists to play when offline. Stream your music to Airplay enabled speakers or Chromecast devices, including Chromecast groups such as your whole house. MusicStreamer plays lossless FLAC, OPUS and WAV files as well as MP3, M4A, AAC and AIF. Supports gapless playback. Scrobble to last.fm. We would love to hear your feedback at [email protected] and this will drive new features in future updates. To find out more visit our website www.stratospherix.com/products/musicstreamer/ For support email [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
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Zustand
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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.
