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
Lysoniq
Lysoniq is a premium music player/streamer with cross-device remote control
$14.99 · In-app purchases
PRICE
$14.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
64 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 included16 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 Lysoniq: 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 robust offline music management and downloads.
Assumption to check: Limited offline listening capabilities
Validate with people who use this workflow before building.
Hypothesis 2
Implement advanced search filters and suggestions.
Assumption to check: Basic search functionality
Validate with people who use this workflow before building.
Hypothesis 3
Provide multiple subscription tiers and customizable plans.
Assumption to check: Subscription model lacks flexibility
Validate with people who use this workflow before building.
Hypothesis 4
Enhance sharing features for playlists and favorite tracks.
Assumption to check: Limited 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
Lysoniq is a premium music player/streamer with cross-device remote control. Install it on your Apple devices to seamlessly play music through any one of them and control the app with the others. Unlike AirPlay, the playing device streams directly from Apple Music at full resolution — enabling Hi-Res Lossless with zero compression or downsampling on compatible devices. Using an iPhone, iPad, Mac or Apple TV in your hifi system just became easier. No more extension cables or compromises. Built to handle huge libraries — load thousands of songs into the player without slowdown. Full queue management with swipe to delete, drag to rearrange, tap to skip ahead, and insert into the queue. True Shuffle that actually randomizes your music. Browse the full Apple Music catalog with top songs, albums, and playlists across 30+ cities and countries, 17 genres, and dedicated Hi-Res Lossless and Dolby Atmos sections. Access Made For You, Recently Played, New Releases, live radio stations, and all of Apple Music's personalized recommendations. Your full synced library with sorting and filtering included. Connect and control devices across your home Wi-Fi network with LYNQ. Extend connectivity across cellular data and different Wi-Fi networks with the LYNQ+ subscription. Built-in Last.fm scrobbling with full history and stats. Four themes including Light, Dark, True Light, and True Dark. Built from the ground up with audiophiles in mind. Reviewing audio gear? Use a subloop to focus in on a particular section of a track, with the option to add a timer between loops to switch equipment. Output up to 24-bit/192kHz on iOS, 24-bit/192kHz on macOS (played via Music.app), and 24-bit/48kHz on Apple TV (24-bit/192kHz available on tvOS 27 with latest generation hardware). Now available in 22 languages including Chinese (Hong Kong, Simplified, and Traditional), Dutch, Finnish, French, German, Hebrew, Hindi, Italian, Japanese, Korean, Norwegian Bokmål, Polish, Portuguese (Portugal), Russian, Slovak, Spanish, Swedish, Thai, and Turkish. Provide feedback to guide its development further and get the features you want. Enjoy all future updates with a one-time purchase. Requires Apple Music installed on your devices and an active Apple Music subscription. See https://www.lysoniq.app/support for more details. Terms of Use: https://www.lysoniq.app/terms License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Compatibility includes iOS 16.4+, macOS 14.6+, tvOS 17.6+
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
axios
react-navigation
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.
