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
LiveTunes - Concert FX Player
The only music player that turns your living room into a concert hall.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
449 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/
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 LiveTunes - Concert FX 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
Allow users to create and save custom effect presets.
Assumption to check: Limited customization options for audio effects.
Validate with people who use this workflow before building.
Hypothesis 2
Provide clearer explanations of what each purchase offers.
Assumption to check: In-app purchase confusion.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize audio loading and playback for better performance.
Assumption to check: Performance issues with large libraries.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate social sharing options for users to share their favorite tracks.
Assumption to check: Lack of social sharing features.
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 only music player that turns your living room into a concert hall. LiveTunes uses ground-breaking, convolution reverb from Goodhertz to simulate acoustic spaces for a variety of live venues including stadiums, arenas, theaters, concert halls, clubs, bars and more. This technology allows LiveTunes to literally make any track sound bigger and better than ever before. It’s like you’re really there! But that’s just the beginning… What really makes LiveTunes so unique is that it also adds the live ambience you’d find at a live concert. Audience screams, cheers, and claps that literally ‘react' to whatever music you choose add the energy to your music that it's been missing. You can even swipe up on the music player to make the crowd cheer whenever you want! It’s time to rediscover your favorite music. Don’t just listen to it. Experience it! AVAILABLE VENUES Sold Out Arena Rock Stadium Concert Theater Hollywood Club Dive Bar Headbangers Ballroom Symphony Hall Coffee House Outdoor Festival IN-APP STORE VENUES Tokyo Dome Rock Fest Back to School Opera House NYC Hip Hop Club DJ Dance Party Garage Days Roman Amphitheater Concert Bowl Austin City Music Hall L.A. Coliseum Teen Mania Metal Arena Budokan Living Room Showcase NYC Cathedral Shibuya Indie Rock Club L.A. Unplugged Tokyo Opera City London Pub REVIEWS "LiveTunes breathes new life into your music." - USA Today “Makes regular music sound like a live concert. Not a gimmick!” - evolved.fm "Reaches places other music apps just don't go." - GoodWebGuide FEATURES * High-definition reverb and sound to simulate real venue acoustics * Professionally recorded live audiences that react to your music and can be controlled by you * Customize your sound with a 6-band equalizer * Swipe up on the player to make the crowd cheer! * Multiple venues and audience sizes to choose from * Swipe left or right on the Player to skip through tracks ***REQUIREMENTS: LiveTunes is only supported on the following devices: iPhone 5, iPhone 5S, iPhone 5C, iPhone 6, iPhone 6 Plus, iPhone 7, iPhone 7 Plus, iPad 2, 3rd and 4th gen, iPad Air, iPad Pro, iPad Mini and iPad Mini with Retina Display.***
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
Supabase
react-navigation
expo-av
zustand
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.
