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
8DAudioPlayer
8D Audio Player transforms your music into an immersive, movement-rich spatial experience — now with built-in Focus Tools for ADHD, studying, and deep concentration
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 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 8DAudioPlayer: 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
Introduce advanced audio effects and customizable settings.
Assumption to check: Limited audio playback features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Add features for users to share music on social media.
Assumption to check: Lack of social sharing options
Validate with people who use this workflow before building.
Hypothesis 3
Implement offline downloads for users to listen without internet.
Assumption to check: No offline playback capability
Validate with people who use this workflow before building.
Hypothesis 4
Redesign UI with modern aesthetics and intuitive navigation.
Assumption to check: User interface feels outdated
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
8D Audio Player transforms your music into an immersive, movement-rich spatial experience — now with built-in Focus Tools for ADHD, studying, and deep concentration. No account required. Key Features • 8D Audio Engine Experience your music in a new dimension with customizable swirl speed, depth, reverb, and dynamic motion paths. • Music Library Access Play any non-DRM tracks from your Apple Music library instantly. No sign-in, no setup. • Local File Support Import your own audio files and create personal playlists directly inside the app. • Real-Time Focus Tools (New) Generate calming or concentration-boosting sounds directly on your device — no downloads, no streaming: • Brown Noise (deep and grounding) • Pink Noise (balanced for long focus sessions) • Pure 852 Hz Tone (quick mental reset) Choose your duration and stay fully in control. • Hi-Res & Lossless Awareness The app detects your current playback path and displays whether you’re listening in true lossless or Hi-Res quality. • Designed for Simplicity Clean UI, zero accounts, no hidden fees, and lifetime updates included. • Built with Feedback We evolve quickly — your input directly shapes future features. Please Note DRM-protected Apple Music tracks cannot be played. Ensure your songs are DRM-free to access full 8D and Focus Tool functionality.
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 Navigation
Expo AV
React Native Gesture Handler
Async Storage
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.
