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
Hi-Fi
Hi-Fi provides fast, simple access to your music library on iPhone and iPad.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
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Combine features and design from your favorite apps.
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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 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 Hi-Fi: 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 for free users.
Assumption to check: Limited offline functionality for free users
Validate with people who use this workflow before building.
Hypothesis 2
Implement smarter music recommendation algorithms.
Assumption to check: Limited music discovery options
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing options for tracks and playlists.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to create and customize their own playlists.
Assumption to check: No customizable playlists
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
Hi-Fi provides fast, simple access to your music library on iPhone and iPad. Hi-Fi’s streamlined design means less clutter and fewer distractions. It’s your music, without the noise. Features • Play music from Apple Music*, iTunes Match*, or your music files synced from a Mac or PC. • Browse, search, and sort your music library — including albums, artists, genres, playlists, and songs. • Search the Apple Music* catalog for more music. • Use the Now Playing interface to manage your playback queue. • Mix it up with shuffle mode, or repeat your queue or individual songs. • Stream music using Bluetooth or AirPlay. • Listen to music at the highest available quality, including AAC, lossless ALAC, Apple Digital Masters, and Spatial Audio with Dolby Atmos. • Listen without a connection — offline mode filters your library for music you’ve downloaded to your device. • No ads. Ever. • Hi-Fi is private. We don’t track our users. Not Supported by Hi-Fi • You can’t delete music in Hi-Fi. • You can’t create or modify playlists in Hi-Fi. Requirements • An iPhone or iPad running iOS 26 or iPadOS 26 or later. • For Apple Music subscribers: • Apple Music app must be installed on your device. • For iTunes Match subscribers: • Apple Music app must be installed on your device. • To listen to locally synced music files: • Mac with Apple Music app; or • Windows PC with Apple Music and Apple Devices apps installed. * Apple subscription required to access Apple Music or iTunes Match library sync services.
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
react-navigation
axios
react-native-reanimated
expo-av
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.
