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
In Progress: Local Music
IN PROGRESS — LOCAL AUDIO PLAYER
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
9 ratings · Top 5%
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 In Progress: Local Music: 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
Incorporate personalized recommendations based on listening history.
Assumption to check: Limited music discovery features
Validate with people who use this workflow before building.
Hypothesis 2
Add features to share playlists or tracks with friends.
Assumption to check: No social sharing options
Validate with people who use this workflow before building.
Hypothesis 3
Enhance offline capabilities with better caching and management.
Assumption to check: Offline mode limitations
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize the interface and create themes.
Assumption to check: Lack of user customization
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
IN PROGRESS — LOCAL AUDIO PLAYER. Pay once. Own it forever Every session leaves a trail of files — demos on your phone, sessions from your DAW, references sent over WhatsApp, ideas recorded at 2am. They're everywhere. In Progress is where they all live YOUR FILES, ONE PLACE. Import from anywhere: Files, iCloud Drive, WhatsApp, AirDrop, Voice Memos, Finder. Share any video from the Photos App, and we extract the audio automatically — no extra steps. Organize with playlists and folders, nested however you think. Sort by name or import date BUILT FOR PLAYBACK: A manual queue - Add any track on the fly, drain it, keep going. Loop one track, loop all, or shuffle. Full lock screen and headphone controls. Beautiful, tactile interface built for daily use. SHARE YOUR MUSIC: Send any playlist to another In Progress user via AirDrop — everything travels together, the playlist and every file inside it — no cloud, no account, no internet. Just tap, and it's there. Works with iMessage and WhatsApp too. KNOW YOUR MUSIC: Detect the musical key of any track instantly — no internet, no upload, processed right on your device. Need to match a reference or play along in a different key? Transpose any track offline, semitone by semitone. The original file is always preserved. Revert anytime. FOR PRODUCERS: Unlock Producer Tools in Settings to go deeper. On the player, swipe the controls left to reveal a second page built for serious listening. Set an A/B loop section with a long press on the scrubber — lock any passage and repeat it until you own it. Control playback speed from 0.5× to 2×, with pitch preserved. Hold to reset to 1×. Everything happens on your device. No internet. No cloud. No waiting. NO SUBSCRIPTIONS. NO ACCOUNTS. NO INTERNET. EVER. Your music lives on your device. Not in someone else's server. Not behind a monthly fee. Download once, own it forever — today, tomorrow, and in ten years. IN PROGRESS — YOUR MUSIC, YOUR RULES. Feature List: - Import from Files app (single files or entire folders) - Import from third-party messaging apps (WhatsApp, iMessage) - Import from Voice Memos - Import from Photos App - Create Playlists - Add your Files to your Playlists - Import Entire Playlists from Other Users - Share Entire Playlists with Other Users - Create Folders of Playlists - Endless Nesting of Folders - Sort Your Music - Lockscreen and Dynamic Island Controls - Shuffle Mode - Loop and Loop One - Double-tap to Skip 5s/ 10s/ 15s - Queue and Add to Queue logic - CarPlay - Small Home Screen Widget - Analyze the Key of your Music (More Info) - Transpose your Music - Trim your Music - Loop Section A/B - Playback Speed (hold for 1x) - Pitch Preservation On/Off - Large Text Setting - Light/ Dark mode - Take Notes on Your Tracks
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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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.
