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
Radio Unit
Discover a world of music with Radio Unit, a sleek and powerful Internet radio player with a built-in Audio Unit (AUv3) plugin.
$6.99 · In-app purchases
PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
58 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 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 Radio Unit: 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
Aggregate more diverse stations and user-generated content.
Assumption to check: Limited station variety compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement better caching and buffering strategies.
Assumption to check: Occasional buffering issues during playback
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and improve UI layout.
Assumption to check: User interface can feel cluttered
Validate with people who use this workflow before building.
Hypothesis 4
Add a feature for users to download stations for offline access.
Assumption to check: No offline listening capabilities
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
Discover a world of music with Radio Unit, a sleek and powerful Internet radio player with a built-in Audio Unit (AUv3) plugin. Elevate your listening experience by enhancing streaming audio in real time using your favorite third-party audio processing plugins (not included) within AUv3-compatible hosts like Drambo or GarageBand. Features: • Intuitive Interface: Enjoy a clean, user-friendly design for effortless navigation. • Song Discovery: Tap to add the currently playing song to your favorites, then open it in the Apple Music app or search for it on Google. • Massive Station Library: Access over 35,000 radio stations—search by name, browse by genre or location, and sort by popularity. • Favorites Sync: Save stations and songs to your favorites list, seamlessly synced across your devices. • AUv3 Integration: Use Radio Unit as a standalone app or as an AUv3 plugin in hosts like Drambo, GarageBand, and more, with support for multiple plugin instances. • MIDI Mapping: Control buttons can be triggered by MIDI Note events (C3 to F3). (AUv3 only) • Battery Efficient: Stream music without draining your device. The app requires internet connection.
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
Redux
expo-av
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.
